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A lot of auto part stores will test them for free. Give them a call.
Your alternator can only be tested when the engine is running, therefore you will have to get a boost or use a battery charger for the battery. If you have a voltmeter, test at the battery terminals with engine still running, if you get 13.5 to 14.7 volts, the alternator is charging. In some cars, the voltage could go over 15 volts if the battery is close to dead (right after being boosted), but the voltage should go back to normal as the battery gets closer to fully charged. Turn off the engine, the voltage will go down to 12.5 volts if the battery is now charged, lower if is not. If there is no change, the alternator is not charging.
KGP484
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∙ 13y ago
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Dodge avenger battery dead?
Charge it, replace it,test the alternator,Charge it, replace it,test the alternator,
What could cause a 1999 Regal LS to occasionally have a dead battery the battery and alternator test good?
Bad connection, connections to battery aren't tight.
How do you wire alternator to a battery to test alternator?
run it and then disconnect the negative wire from the battery if alternator dies its bad.
Will a dead alternator drain a battery?
Yes. If the alternator is dead and you drive the vehicle, all the power is coming from the battery and it will eventually drain completely. Also, if a diode is shorted inside the alternator, that can drain a battery.
Why does battery go dead?
Alternator is defective, dead cell in the battery, or something is on pulling power from the battery.
Why is your battery not charging when you drive?
dead battery dead alternator dead voltage regulator each needs to be tested.
Why does the battery not charge?
Corroded or loose battery connections, loose alternator drive belt, defective alternator, or dead cell in the battery.
Will battery recharge after bad alernator is replaced?
An alternator is designed to keep a fully charged battery at peak level. It is not designed to charge a dead battery. Installing a new alternator on a car with a dead battery can in some cases ruin the new alternator. Fully charge the dead battery before starting the engine.
What can cause a battery light to come on when the battery and alternator both test good on a 1992 SC 400?
Battery light usually means alternator not charging. Most common solutions would be be a bad alternator, bad connection, or loose alternator belt. If the battery and alt test ok than check the connections to the alternator and battery.
How do you tell if it's the alternator or battery?
Have a shop load test the battery.
Why does battery go dead when hooked up but alternator is good in geo metro?
check your battery ground and your alternator ground
If you constantly run your car with a dead battery will this hurt your alternator?
Yes, alternators are designed to maintain the battery, or recharge a battery that has been slightly discharged from starting the car. When the alternator is used to recharge a dead battery, it causes the alternator work harder and longer than it is designed for, causing it to overheat, thus causing damage to the alternator. A battery charger should be used instead. They are designed for charging dead batteries. After the battery is charged, let the alternator maintain the charge.
