Alternator Voltage Too High

As a rule of thumb, 12-volt alternators use one horsepower for every 25 amps of output, or to put it another way, their ratio of output to horsepower load is 25:1. The lightweight alternator supplying the power required by the motorcycle has an output of 720W at 60 amps. 1 volts per cell, or about 6. if the voltage is higher than 16 volts, there might be a loose connection on the battery terminals or the alternator output terminal or the autolink fuse. The voltage reading should be 0. Connect all plugs and wires to the DC Power alternator as they were on the OEM unit with exception of the charge lead. The regulator monitors the exciter excitation current as a function of the alternator output voltage. Any problems with your alternator or voltage regulator? Is it the voltage regulator or alternator that is causing the issue? Need to know about Honda voltage regulator? Get answers to all your questions about Honda voltage regulator problems by asking Honda Mechanic Experts on JustAnswer. It also contains the carbon brushes which contact the rotating part of the alternator shaft (slip ring) to the non rotating part of the alternator. P0634 - PCM/ECM/TCM Internal Temperature 'A' Too High - DME internal fault, inside temperature sensor: Value too high P0641 - Sensor Reference Voltage 'A' Circuit / Open P0651 - Sensor Reference Voltage 'B' Circuit / Open P0686 - ECM Power Relay Control Circuit Low P0687 - ECM Power Relay Control Circuit High: DME main relay: Voltage too high. 5vdc when its warmed up to 15. Also check that the quick connector plugs are clean. Why alternator not building up voltage Loss of residual magnetism cos it was idle for long time or it was motored before; Field excitation ckt is open or very high resistance wire broken voltmeter faulty, too many rotary diode shorted or fuse of diode blown rectifier,transformer…. nationsautoelectric. Note: Some have suggested disconnecting the wires from the (D+) and (DF) terminals on the alternator/generator, then connecting an ammeter across the terminals to check the operation of the generator/alternator. I have to agree with that suggestion. This seems awfully high compared to the max of 14. Not long ago, an 80 amp alternator was considered a high output unit. It converts alternating current (AC) to direct current (DC). Just because the alternator is 2 years old is no reason the voltage regulator couldn’t be going bad. Alternator overcharging at high rpm. Jan 13, 2013 #3 BigDwithaZ Veteran Member. When I put a voltmeter on it, it reads just over 15V (while running of course). Short or open circuits, or high resistances, in the stator windings. If the voltage dips below the optimal range, then the regulator kicks in to get the alternator to make more voltage. normally, the voltage reads 4. Most of the time though, the only code I’m getting is the first one mentioned. and don't check while cranking as the voltage could be a bit higher but idling, definitely shouldn't be more than 500mv. A ground connection on the alternator case completes the electrical circuit. Some of the posts are marked, ac, ign, 14V. The device provides a high output signal at a low operating voltage and reduces the overall supply voltage while maintaining comparable output levels to traditional equivalent Browse Pressure Sensor Chips Datasheets for All Sensors Corp. 8 volts for an AGM is just right. That seems a little high, so I put the meter on it and got reading of 15. With the engine at about 650 RPM, put a fairly heavy load on the electrical system: landing and taxi lights, interior lights, fuel pump (s), beacons and strobes. By doing a visual inspection of the engine compartment, you can determine if a belt is too loose or too tight. Using a meter or LED lights, they will indicate when the system voltage is unusually low or high. automotive alternator. With AREP excitation, the R438 electronic AVR is powered by two auxiliary windings which are independent of the voltage match circuit. " ensure the engine is running for best results. Voltage of a transformer at a given flux density increases with frequency and also decreases with it. Died next day on the way to school. It turns off my speaker amplifier as soon as I hit the. The desired full charge voltage is 14. Generally, an acceptable voltage output range for automotive applications is. At first I thought the voltage at the dash was too high (14. Is 15 volts too much???. The battery voltage should not drop below 12V when idling, and should be between 14 and 14. Their field winding is replaced by a permanent magnet and a too-high voltage is cut off by shunting out one or more windings. It the voltage is bouncing around between 15-17 volts which is too high. Got it home and put my voltage meter on it. Include properly size fuses or fuselinks inline too. What Is An Alternator And What Happens When It Fails? If voltage production is too high, the regulator simply decreases the current flowing through the stator, keeping the electrical supply. Pin 1 = Alternator Feedback. You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. Im trying to avoid buying a new alternator if its just the regulator, or avoid buying a regulator if its just the alternator. Ducati Roundcase Bevel Voltage Regulator. The scan showed that my battery voltage was at 17. 5 at 2000 RPM is too low and above 15 volts at 2000 is too high. The alternator (via internal voltage regulator) will set the alternator output voltage so that the "voltage sensing input" is at e. For example a NiMH battery is about 1. 45 volts while being charged. High amperage is what this unit is all about and that shows in the selection of components from the high temperature windings all the way to the press fit diodes. Chang the stator. 0v or more lit up!). As such we will cover testing both systems in today's article. 9 depending on the voltage regulator installed on your alternator. Shorted or open diodes in the rectifier bridge may also cause this problem. HIGHER VOLTAGE CANNOT COMPENSATE FOR TOO SMALL AN ALTERNATOR - The voltage level of the XSvolt system can only be maintained if the alternator is operating at or below its amperage capability. The one in the Camry doesn't say anything regarding max voltage, but I am thinking 14. Brushes and Alternator on a Brushed Alternator - Duration Silent Diesel / China Diesel voltage regulating capacitor remove and replace. Didn't want to cause any damage to the car with the alternator outputting too much voltage. If the voltage regulator fails, it can result in an output that is too low to charge the battery (undercharging) or too high to safely run the electrical system (overcharging). So if we somehow fool the regulator into thinking the alternator output voltage is 0. 5V at 3000 rpms. if the voltage is higher than 16 volts, there might be a loose connection on the battery terminals or the alternator output terminal or the autolink fuse. Too high current through or temperature at internal relay. The battery is a little pickier about its charging voltage. 4 volts the old one allowed. 3L 1998 Felicia and the Alternator test showed that the output was High (the cheapo tester I used has 3 lights and the Red one 14. With the regulator disconnected, the stator output voltage will be dependent on engine speed. I would first check to make sure that your batteries are being properly charged by your alternator, check the voltage regulator on the alternator for correct voltage output (usually at 14. 0 volts drop at the 55 amps. If your battery voltage is too high and the battery becomes damaged, or your battery is over 5 years old, you may need to replace the battery by going to your nearest parts store and using the car battery size chart to find the right replacement. I think your battery amps is the best first check and then your voltage regulator. yank the alternator and have it tested. On top of that labor might be $180 for troubleshooting, installation and testing. Watch before you buy! - Duration: 12:17. CAUTION: Full fielding the alternator can result in high voltage. When there is no provision of using separate alternator for high voltage testing in the lab, this method is applied. 6 volts higher than this. If the voltage is to high the battery will charge too quickly and may over charge. Started engine voltage meter registered 11. If it is 15. Check your work again, as if somebody else did it. The charge light can come on because the regulator pack is failing and providing too high a voltage with the engine at speed, as happened to me (15. your fuse box, you can be assured that the fuse box is at 14 volts, even though there is a voltage drop between the alternator and your fuse box. I have to agree with that suggestion. The battery is a little pickier about its charging voltage. Alternator not charging at all. When setting a current regulator, it's necessary to put enough load on the battery to drop the voltage well below the VR setting. An alternator’s fan draws air _____ and. Some alternators are "single wire"(not counting the frame ground) and produce around 14. Add battery testing to your MDMAX, MDMAX2A or MDMAX3 to save time and test batteries inside or outside the vehicle; Charging and starting system tests include: charging voltage and results, charging voltage too high/too low and low cranking voltage. The key output voltage is determined by the stator series resistance, the RPM, the number of windings, and the field current. Misalignment (coupling). Here's why: Amperage is basically the amount of electrical current your alternator can supply. If the voltage is over 13. The TecMate Cranking And Alternator Tester is the ultimate pocket tester for on-vehicle battery performance and alternator voltage testing that every gear head should have. Is this too high? The Haynes manual doesn't give a voltage. CAUTION: Full fielding the alternator can result in high voltage. When we were cruising his lights get brighter at 4k rpm and up. yank the alternator and have it tested. The one check engine light I’m getting a lot is “incorrect voltage to PCM”. The faster you spin the alternator the greater the alternator efficiency and the cooler the alternator will run. The regulator protects the battery voltage and when the battery voltage climbs too high it shuts off current to ground and bleeds it off as heat. This is a 5. Even a stock alternator is capable of massive voltage output, but is regulated to around 14V through the voltage regulator. As a rule, the charging voltage with the engine at fast idle should usually be about 1-1/2 to 2 volts higher than battery voltage. It also contains the carbon brushes which contact the rotating part of the alternator shaft (slip ring) to the non rotating part of the alternator. the ac output should be less than a volt, if it is more, suspect a diode filter caps will help for a while, but can cause trouble too. The first winding has a voltage in proportion to that of the alternator (characteristic Shunt), the second has a voltage in. The target alternator voltage (V). Too high charge voltage causes excessive gassing and will eventually damage a lead-acid battery. The regulator contact flips back and forth applying full voltage to the field and then taking it off. [Page 2] Voltage too high?. The ideal car battery voltage range will provide you with a relevant interval according to which you can measure precisely what the voltage says about the battery’s current charge. Don't run it much above idle speed, for you are "full fielding" the alternator, taking the regulator out of the system, and if you rev it too high, the alternator can produce enough voltage to blow bulbs and cause other damage. 2 volts) to effectively charge a 12 volt car battery. If the voltage regulator fails, it can result in an output that is too low to charge the battery (undercharging) or too high to safely run the electrical system (overcharging). Login Sign Up Logout Alternator overcharging at high rpm. After I started the engine again, the battery light was off, and it hasn t come on since then. If not; inspect circuit for open and repair. Had one go out on a 10si, and after replacing internal voltage regulator with no improvement, turned out to be diode trio. This alternator is uniquely designed and engineered to provide the finest performance and durability for your vessel. 45 volts while being charged. 5vdc when I first start it up on a cold morning. Also can cause unusual behavior of the car electronics. FarmCraft101 1,303,685 views. Contact your John Deere dealer. flowing through the rotor windings. Components that are not switched. You should be in the 13-14. The voltage regulator will allow the alternator to make enough power to maintain proper voltage level, but not allow system voltage to rise to a harmful level. 4 volts it would be 144 watts and at 16. Learn what does P1594 Charging System Voltage Too High means, location and how to repair? When the Powertrain Control Module (PCM) regulates the generator field and the there are no detected field problems but the voltage output does not. 2, your alternator is creating too high of a charge and likely has a voltage regulator problem. It is wrong to use alternator sales brochures in which voltage, perhaps not even stated, is not high enough to keep the battery charged; or, at least close to fully charged because it is possible for the system output voltage to sag from a large load (big headlamp, driving lights, heated clothing, poor battery, etc). Check your work again, as if somebody else did it. Posted 7/14/2012 20:16 (#2485342 - in reply to #2484663) Subject: Re: 12v charging system. I heard that the voltage regulator is in the alternator and so I replaced the alternator. Install the DC Power high-output alternator. Battery damage begins when the internal temperature becomes too high, causing it to gas and heat up. Check for voltage drops at the positive and negative battery cable connections, the alternator BAT+ power connection and the engine ground strap(s). If you have a Delco internal regulator type alternator, and the output voltage is above 15 volts, but does not go higher when revving engine, check the internal diode trio. That is what the heat fins on the regulator box are for, to dissipate the heat. Pin 2 = Alternator Load Request. The voltage decreases, even disappear. Rpm's aren't that big of a deal. Inspect alternator wiring for corrosion, loose connections and breaks in insulation. Compare 2007 Ford Ranger Alternator brands. Ontario Hydro's extreme range for voltage at a rural service entrance is 212 to 254 volts. Voltage from the regulator is too high. Without engine running registered 11. A lamp that runs continuously on 14. If it decreases and starts to drop until vehicle eventually dies, you have a defective alternator. The wire connections should be checked first to make sure they are not only tight, but free of corrosion. So does anyone have any input on what I can check or do to determine if the problem is the battery, alternator or voltage regulator(V? Searches show many E class cars have issues with the VR, many say the SLK is sensitive to low battery but if I only see 11. 45V when eng is off. However, as soon as I disconnect the battery the car idles just how its supposed to idle. 5 and 14 volts give or take a half of volt. Voltage reading at dash with new alternator 13. You are correct, 18 volts is much too high, but an alternator can not cause over-charging unless it is assembled incorrectly with one of the brushes grounded through its mounting screw. My gut feel is that initially it probably is too high but overall it seems to be functionally normally. I would take alternator to another shop for a bench test. Was going to buy a new alternator, but luckily I found a barely used rebuilt alternator locally (AL0703X) from a wrecked E46. With regulators for the alternator system, voltage limiting is the means of controlling output. Just because the alternator is 2 years old is no reason the voltage regulator couldn't be going bad. Is this a normal reading for a honda v6, and if not, what is causing the high output, and why did I lose all power?. The alternator and the coils are about the only things on the car that can step-up voltage, but there is no evidents of excessive voltage from address 61. Such as a worn-out alternator. So no problem - also with no lights, the alternator output remains at 15V. My old alternator (also High output) would run at 11. Voltage too high in charging system While driving on the highway my "Check Gauges" light came on. If your battery voltage is too high and the battery becomes damaged, or your battery is over 5 years old, you may need to replace the battery by going to your nearest parts store and using the car battery size chart to find the right replacement. [Page 2] Voltage too high?. In order to get maximum battery life proper charging voltage must be maintained. High charging system voltage is usually caused by a stuck closed voltage regulator. Started engine voltage meter registered 11. 85V, so no ground short in the alternator. The battery in my R31 says it can have a max terminal voltage of 14. 4V within seconds of starting. After I started the engine again, the battery light was off, and it hasn t come on since then. I got a voltage/alternator issue where the car would idle extremely bad, fall to 400 and up to 1000+ and so on so forth, idle is about 900. The battery’s natural voltage is 12. For more free information fill out our request form, e-mail, or call (573) 334-2632 to speak with a friendly and knowledge professional available to answer all of your alternator questions. The ARRID AVC can be used for appliance combinations that have a maximum rating of 25 amps @ 12v DC. Anything much over 14. Err 15 Operator Present. Watch before you buy! - Duration: 12:17. After the guy looked at it he told me my alternator was putting out too much power and I might need to have it replaced. Re: Good Alternator But Low Output to Battery 08/29/2008 10:44 AM Battery was fully charged and two new alternators were installed in succession as stated above. 5 volts or more will soon burn out. My Evinrude 70hp -89 is charging too high voltage. If the output voltage is too high, the regulator lowers the current flowing to the field coil. 5 volts when I hit the gas, and 15v idling. 6 volt drop, it will not be passing this higher current. If is gets less than this or the voltage is erratic, it can have intermittent random problems. Connect clips to the battery or connect to an installed SAE battery lead, then check battery charge level. Rpm's aren't that big of a deal. Even a stock alternator is capable of massive voltage output, but is regulated to around 14V through the voltage regulator. That seems a little high, so I put the meter on it and got reading of 15. Here is what I have done to attempt to troubleshoot the problem. Normally you don’t have to do anything to control the mechanical input. If you see the voltage dropping due to a rather large load you can increase the voltage output of the alternator to counter-act the high load demand. Besides, it goes high quite quickly depending on alternator capacity and total load. Normally float voltage is around ~13. The Fluke meters are auto ranging and will read the proper voltage level without changing ranges. The regulator monitors the exciter excitation current as a function of the alternator output voltage. I am currently having some [concerns] with the particular CDI replacement voltage regulators (194-5279) used in conjunction with 3- and 4-cylinder Mercury two-strokes. When I put a voltmeter on it, it reads just over 15V (while running of course). P0563 is a diagnostic trouble code (DTC) for "System Voltage High". When im standing still and not moving, the voltage reads over 14 volts at about 15 until i start moving and then. battery/alternator visit workshop diy Typically you get BATTERY/ALTERNATOR VISIT WORKSHOP warning when the electrical system voltage in the car is below 12. Too low belt tension causes belt slip, pulley heating, bearing heating, and ultimately bearing failure. In addition to checking the alternator's voltage output, you also need to check its current or amperage output. Alternator charging too high The battery started to spew water, the alternator is frying the battery. These numbers assume 100% healthy cells, and may vary a bit lower for older batteries. Most late model alternators produce 120 to 155 amps or more. If your battery voltage is too high and the battery becomes damaged, or your battery is over 5 years old, you may need to replace the battery by going to your nearest parts store and using the car battery size chart to find the right replacement. I checked it with my radio shack volt meter, yep 15 volts. Charging voltage too high now is thinking a alt is a genarator. "Voltage drop between alternator post and battery and battery and ground should be less than. Voltage is sensed at or close to the battery for regulation as that is the important area. Where are you seeing the high voltage? At the battery terminals? When the system is "acting up", What is the DC voltage at: The battery terminals? The #2 terminal at the voltage regulator?. You can get a cheapo voltmeter that plugs into the cigarette lighter and gives a digital readout of the system voltage. • Start the engine. If we use a diode at a higher current then the voltage drop will be higher and therefore the output voltage of the alternator will be increased by more. The amperage rating on an alternator is basically just the amount of current that the unit is capable of putting out, not the amount it always puts out. Way too high and this is the cause of the flickering since the power management unit is having a hard time dealing with the high voltage. "Voltage drop between alternator post and battery and battery and ground should be less than. Excessive battery voltage, TPS floating & rich fuel. Just because the alternator is 2 years old is no reason the voltage regulator couldn't be going bad. Got it home and put my voltage meter on it. When the engine is running, the voltage should be aproximately 14. If the output voltage rises too high, the voltage regulator cuts back the field current, bringing output back into line. If your voltage is low check belt tightness with engine off by attempting to turn alternator pulley by torque wrench while holding prop, if belt slips on pulley at 11-15 ft/lbs it is just right. The inverter works fine for powering a laptop and other gear with out problem. 2 volt line voltage is 13. Such as a worn-out alternator. I think the Voltage Regulator can be removed and a new one put on but as a reman Alternator can be had for less than $100, I'd just install a new one. Too much or too little voltage can damage the battery, as well as other electrical components. Ideally, the voltage drop across any connection should be zero or less than 0. Connect a 100 watt lamp ( you have to use a 100 watt bulb not a new energy saving curly fluorescence) directly to any two alternator wires. This assumes that the amplifier can handle voltages as high as 16. If alternator voltage drops more than. You should get a reading of battery voltage for each one; if not, there is a broken connection and the alternator cannot change the battery. However, if it is less than 13. Voltage drop tests are most effective with high amperage circuits, and are often used when diagnosing the starting and charging systems in automobiles. Rpm's aren't that big of a deal. 6 is too high and it might have been the reason for the water level dropping so fast and the battery dieing. The voltage you are talking about is on the high side, but it depends what battery type is registered, what the temperature conditions are, and if the system voltage always stays high or is just for a short time. If your vehicle begins showing signs of reduced power like dimming headlights or interior lighting, you can have you. Hi All, I have just checked the battery and alternator on my 1. High output alternators are available from a number of suppliers. As the bus voltage increases, the voltage value (after overcoming the resistance in the switch) sensed at the ACU rises above the "normal" voltage parameters and the ACU, sensing that the system voltage is too high, reduces the output of the alternator. CAPACITY -The induced voltage of an alternator is proportional to the product of the number of conductors in series upon the armature, the speed of rotation of the field, the number of the field poles, and the magnetic flux per field pole 3. The alternator responds by supplying more current, if it cant keep up, the voltage DROPS. Improperly jump-starting the vehicle can send a surge through the battery that destroys one or more cells in the battery or shorts it out. Died next day on the way to school. Didn't want to cause any damage to the car with the alternator outputting too much voltage. In order to get maximum battery life proper charging voltage must be maintained. TROUBLESHOOTING Ignition Coil Troubleshooting: (No) Fire in the Hole. Overcharging can generate hydrogen sulfide gas and cause the battery to explode. Too high charge voltage is FATAL for a LiFePO4 starter battery! Microprocessor accuracy. Vlad Fred Kovac. My '99 silverado has what seems to have high voltage output from the alternator. batteries are 6 months old. One thing alone, the battery is being subject to a voltage higher than the 13. That seems a little high, so I put the meter on it and got reading of 15. A smaller diameter pulley can be used on an alternator because it is more difficult to damage an alternator by too high of rotor speed. IMPORTANT: Running a performance externally sensed alternator through a battery switch is a poor choice for a number of reasons, voltage drop and voltage corrections driving DC loads voltage too high are but two reasons why this is a poor choice. The sensors are supplied by regulated voltage from the ECU, so the battery voltage has jack all to do with sensor life. The alternator will run high until everything is charged up, then drop the voltage. A qualified mechanic will be able to tell you what the operating voltage is on your car. This voltage will be maintained when the battery is fully charged and the electrical load is low. Ideally, the voltage drop across any connection should be zero or less than 0. 5 volts for a 12 V system and. it will fluctuate down to 13 volts too. With the engine off, you should get a reading of 12. Alternator charging too high The battery started to spew water, the alternator is frying the battery. Not long ago, an 80 amp alternator was considered a high output unit. Could be another bad alternator, but it could be something else. It only shuts down if the voltage gets to low, it has never kicked off for too high of voltage. Installation tips. I got a dual voltage alternator. So, as a summary, you should be measuring the voltage at the battery terminals. I think your battery amps is the best first check and then your voltage regulator. it will fluctuate down to 13 volts too. Voltage reading at dash with new alternator 13. The volt gauge has always read a BIT high, but never more than like 14. One is a big fat wire that goes to the battery, this is the alternator output. 150 kmiles. Using a meter or LED lights, they will indicate when the system voltage is unusually low or high. Learn what does P1594 Dodge Charging System Voltage Too High means, location and how to repair? When the Powertrain Control Module (PCM) regulates the generator field and the there are no detected field problems but the voltage output does not. Features & Benefits. Usually when alternators failed prematurely is because of a bad battery (electrical), voltage regulator issues, high electric loads (e. That seems a little high, so I put the meter on it and got reading of 15. After the guy looked at it he told me my alternator was putting out too much power and I might need to have it replaced. If you see large overcharge numbers either you have the voltage set way too high or the batteries are failing. If the voltage remains, change the stator of the alternator 1. Didn't want to cause any damage to the car with the alternator outputting too much voltage. The 190 amp Mitsubishi alternators used in 2004+ police cruisers have a one-way clutch on the pulley. Strictly adhere to all limits. Voltage control. Another common application is the alternator that generates the power for the automobile electrical system. If the output is DC, it will probably have 6 diodes to convert the output from the main alternator to DC. The inverter works fine for powering a laptop and other gear with out problem. Bypass coupled with remote voltage sensing for voltage regulator allows harness to have stable voltage levels, and over charging problems are greatly reduced. If voltage is too low, kill all extra accessories and 1 headlight (especially if you unplug the stator) Don't forget to verify that your voltmeter is reading correctlyhad one go bad mid ride and I thought I was getting 21 volts. This is not a small problem. If it decreases and starts to drop until vehicle eventually dies, you have a defective alternator. • Connect a volt meter to the regulator casingand the negative (-) battery post. I heard that the voltage regulator is in the alternator and so I replaced the alternator. If the battery has too high of resistance the amps will be too low to charge it. When the car is running, the voltage should read at in the range of 13. why is my voltmeter reading too high. Field is OFF Alternator not charging Regulator “sees” alternator voltage Volt Drop in battery cables will cause undercharging 69. It turns off my speaker amplifier as soon as I hit the. housing and the engine block. This is controlled by the computer so if the voltage of the car is high enough the computer will actually shut down the alternator and there will be no drag there. charging too high. Car Battery Too high voltage? Um, while driving my car, i was watchin the voltage gauge and it goes crazy between 13 and 16 volts and after a while my speedometer hud turns off. Thus if over current fault occurs. We apply this principle every time we start a motor at reduced voltage. Check the voltage meter to make sure there is not a reduction in voltage with the electrical systems turned on. Small generators like this draw their excitation power from the output of the generator, have no AVR, nor any Boost capability; i. Such as a worn-out alternator. Voltage sensing is supplied on these high performance alternator regulators so we can achieve the correct regulator set point voltage, at the battery itself, not just at the back of the alternator. Sorry but I can't find the link again. Not to be confused with 3 phase stators which have 9 coils. It's too late now, but really, the dyno is the perfect place to diagnose this type of problem. we tried pouring water over it to clean the brushes and all kinds. Operator not in the seat. Radio alternators. This is the maximum field current situation, and should result in maximum output of the alternator. When the engine is running, the voltage should be aproximately 14. If anyone happens to have a waveform of one that works taken at the 2 wire plug to the alternator, or have be able to give duty cycle and peak voltage I surely would appreciate it I just need to know what normal looks like. Alternator charging output increases in proportion to the electrical load on the charging system and engine speed. My car alternator runs at 16 to 16. Got it home and put my voltage meter on it. normally, the voltage reads 4. Have the alternator checked as the gage is probably telling you the truth. And since power factor is a determining factor in the secondary voltage, power factor influences voltage regulation. It's not possible for the voltage to be too high; that's what the regulator is for. Tested voltage across battery terminals 11. I've got a 1986 2-stroke Mercury outboard 60hp. The desired full charge voltage is 14. That high voltage might damage you MSD unit indeed. If you voltage drops below 10 volts when engaging the starter, your battery is dying. This is scaring me and a new one is too expensive. The engine starts fine and cold idles at 1200 RPM for a second, and then fuel immediately begins to dump into the TB for some reason.