Car Alternator Charging Voltage

Your line of thinking is correct in that a good alternator should be charging in the 141-145vdc as long as theres no major load on it. When the engine of your vehicle is running the voltage of your car battery should be between 135 and 147 voltsDuring that time the alternator of your vehicle is busy charging the battery.

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A car alternator needs to be putting out at least 13-14 volts ideally between 138 and 142 volts to effectively charge a 12 volt car batteryIf the alternator is putting out too much voltage 15 volts it is likely your battery acid will boil over out of the battery.

. For best performance and longest battery life AGM batteries should be charged full with a high absorption voltage between 142149V with the exact voltage and time depending on temperature and model see previous article. I have a 2006 Buick LaCrosse with the 38 L motor. If the voltage level rises above 145V the regulator will stop delivering the power supply to the field winding and prevent the alternator from charging.

If these test are good then i believe the charging system is doing its job. Talking about the voltage for a car How much voltage is too much from an alternator A voltage of about 15-16 volts is simply too much. The alternator must also recharge sufficient electrical power to recharge the battery.

The car then uses power from the battery. If youre readings are significantly higher or lower than these then it would indicate a fault with the battery andor the alternator. Check this helpful post to know the details.

It turns off my speaker amplifier as soon as I hit the gas pedal. How long can I drive with an alternator problem. For one a phenomenon known as voltage drop causes voltage at the source the alternator to degrade as it.

The voltage regulator is shorted which is fairly uncommon or the control wire going to it is grounded. Keep the engine running and retest the battery with the voltmeter. It could be my computer or pulleys in the wrong too so I cant risk buying a new one and still having the problem.

Under normal operating conditions an alternator should maintain about 142 volts at 70 F ambient air temperature. The voltage regulator is faulty thus sending two much electric power to the car installation devices and battery. Let us know the outcome.

I replaced the alternator with one that I got from a salvage yard to save. If its old school this is pretty normal and its time to stop charging. This is scaring me and a new one is too expensive.

My car alternator runs at 16 to 165 volts when I hit the gas and 15v idling. I wont say a good alternator will never charge at 165vdc but keeping it there for any length of time will boil the battery very quickly. When the Car Is Running.

A burnt-out alternator stator. So to answer your question Yes 15 volts is too high. Even with the new car battery you dont need to charge for starting the car.

Wrong Alternator and Voltage. When your car is running the cars alternator is charging the battery this is why you should see a higher voltage. Most car alternators that normally recharge your battery after every start and provide power while the engine is running are normally voltage regulated to about 138 to 140 volts.

Somehow the car battery voltage can be below 135 volts. Over-charging is caused by the voltage regulator driving the alternator too hard. I used a charger to charge the battery.

You can carefully tap it with a hammer while the car engine is running while checking it with a multimeter on the car battery to see if the voltage is changing. If the alternator voltage is too low. Start the vehicle and rev the engine to 2000 RPM.

If the voltage change and go back to normal when you tap it lightly with a hammer. The most common reason why your car is not charging the battery is actually because of a worn-out or damaged alternator. This will draw power on your battery which should cause your voltage regulator to kick the alternator into high gear.

An another shortcoming of conventional alternator regulator car charging systems is the lack of float charge stage. All too often the alternator is condemned as the source of the problem if only battery voltage is present with the engine running. Engine running the voltage will be from 135 to 147 volts.

Therefore a voltage appears that is higher than usual. The external regulator has the ability to modify the alternator charge profile. Your vehicles charging system however operates at a slightly higher voltage than the batterys voltage and does so for several reasons.

The other car I have which had a new alternator put in about 30000miles ago showed 142V - 144V when its engine was running. Fifteen 15 volts charge denotes the fault of the voltage regulator of the charging system. So how does the voltage regulator ensure constant voltage.

You know at the time of engine running the alternator will charge the battery. When you read the voltmeter this time the voltage should go up to at least 13. If there is the voltage will be down some from this.

The voltage when the engine is running should be in the range of 135-147 volts. There is a third possibility but it doesnt apply here. The external regulator transforms your car alternator into a three-phase charging system.

If the charging voltage drops below 135V the regulator supplies additional current to the field winding to charge the alternator. A standard alternator that charges the car battery during starting and the voltage range while running the car varies from 125 to 135 volts. It must also conserve an adequate voltage to operate a cars appliances and components.

Stormchaser88 December 14 2015 942pm 1. The car is 2003 Crown Victoria with about 100000. Last week I found out that the alternator was overcharging charging at around 155-157 volts The car has 72000 miles on it.

To test the higher end of the alternator output discharge the battery high beams on until v drops to around 122v Start car the alt should be outputting a higher voltage than 132 until bat charges back up to max. The external regulator or voltage regulator work is to force the alternator to maintain the voltage. If this is the case it only means that the alternator is not charging but does not reveal why.

Car batteries have a resting voltage somewhere between 1245 and 126 volts in most cases. The actual charging voltage designed into a voltage regulator is dependent upon factors such as how far the alternator is located from the battery and the ambient air temperature surrounding the battery as calculated by the PCM. A few days later I checked the voltage of the battery while the engine was running and I got 138V.

Theres two possibilities for this condition.

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