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You may need a new one. It might not be capable of charging as well as it used too.

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14y ago

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Why does the voltage drop down at idle on a 2002 Chevy Tahoe?

The voltage regulator in the alternator is probley weak. Replace the alternator


What alternator will charge at idle on a 350 Chevy?

Any alternator will charge at idle.


Why does the Kia Sportage at idle read 14 volts and when you raise up the RPMS the voltage drop to nothing?

Alternator belt is slipping. Tighten or replace as necessary.


What is the voltage of an automotive alternator?

between 13.5 and 14.5 volts with engine running at idle


Does the alternator charge your battery when the car is idling?

Yes and no. Yes: The alternator will charge the battery any time the engine is running (even at idle) if the battery's voltage is below the threshold (usually around 12 volts) so that the voltage regulator triggers the alternator to generate power (around 14 volts) until the battery is charged up. No: If there is not enough consumption of power, the battery may be charged enough and the voltage regulator will not trigger power generation.


Why is your alternator charging below 12 volts?

Engine idle is too low, alternator drive belt is slipping, alternater is defective, voltage regulator is defective.


Why does battery light go off when accelerating?

Because your alternator starts to generate more power as you accelerate, as opposed to an engine at low speed or idle. The car reads this extra voltage from the alternator, which is trying to charge the battery, and tells the light to go off. This is not normal on a vehicle with an alternator. You need to have the alternator checked as it more than likely needs replacing.


Why Mazda Protege won't charge battery?

One of two things is normally wrong. Either the battery has a dead cell and will not accept a charge, or the alternator is defective. With the engine running at idle check the voltage at the battery with a digital voltmeter set to the 20 Volt DC scale. If the alternator is good you should read from 13.5 to 15.5 Volts. If the alternator has a separate drive belt then it is possible the drive belt is broken.


Why wont your brand new alternator recharge your battery?

Maybe the battery is defective. Check the voltage at the battery terminals with the engine running at idle. You should get 13.5 to 16 volts. If not the alternator is defective or the voltage regulator is bad. If you are getting the correct voltage, the battery is bad or the connections are corroded.


Why does your idle drop when you turn your driving lights on?

Turning the lights on put a load on the alternator causing the idle speed to drop. I would have the battery and charging system tested to make sure everything is okay. The battery may be on its way out.


On a 1990 Ford Probe GT 2.2L Turbo if your headlights and everything else purge at idle and driving is it the voltage regulator or the computer and were is the voltage regulator located at?

It is the Alternator. use a voltmeter an check if voltage with engine running is arrounnd 14v or more. than it s good. if voltage below 14 bad alternator.


Charging system drops at idle but charges up at high idle what could cause this?

That would be the alternator, voltage rgulator, or even a bad ground. Email MYCOMATT167@YAHOO.COM follow up