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Only if the old battery is defective

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Q: Do you need a new battery after installing a new alternator?
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Why does the battery meter stay in the yellow zone after installing a new alternator on a Pontiac Firebird?

If the car has a bad battery the battery will not charge just becaus you put a new alternator in try raplacing the old battery.


Can running a new alternator on a half charged battery cause damage to either the battery new alternator voltage regulator etc?

Not likely, but running the engine with a dead battery can damage some alternators. Always fully charge the battery when installing an alternator.


What should you do if battery was not charged before installing new alternator?

My advice is to charge the battery with a battery charger before starting the engine. You will be putting a heavy load on the alternator if you allow it to charge a dead battery. This could damage the alternator.


What could be wrong if after installing a new battery and alternator truck still wont start or run?

It could be the starter in it. It may be weak or need replaced.


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.


Im on your third alternator battery stays strong but something continues to kill the alternator ive taken the fuse out of the radio have a new starter and alt belt so?

Kills alternator? don't you mean kills battery? Installing a new alternator without first charging the battery well (2amp for 8hrs) will quite likely burn up a new alternator as well as being hard on the battery.


Just installed a new alternator and belt on 1999 blazer - the new alternator is very hot your husband has leather hands and says it very hot Everything is grounded properly?

is your battery Low or poor?? Charge your battery on slow charge for 8hrs to give it a good deep charge, Installing an alternator on a low or dead battery will ruin it and also not charge your battery properly.. An alternator is not a battery charger its a battery maintainer!!


Why is your radio not working after installing a new battery and alternator on your 2000 mercury cougar?

Every time you disconnect a battery cable you have to reprogram the radio stations ( if that's what you are asking )


Will a van start if you need a new alternator?

As long as the battery is fully charged it will start no matter the condition of the alternator. Eventually the battery will run down if the alternator is not keeping it charged.


How do you know if you need a new alternator?

see this link How_can_you_tell_if_it's_your_battery_or_alternator_that's_bad


Why is the battery light on in a 98 Chevy Express van?

you need a new alternator


How can you tell in need a new alternator for a 1997 Honda civic?

Disconnect the batery cable from the battery while the vehicle is running, if it dies, you need a new alternator there, buddy.