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Can you take off the negative wire on battery to test the alternator?
Wiki User
∙ 9y ago
Yes you can take negative off on all cars and test it if it dies alternator is bad if car keeps running then its good.
In older (not computer controlled) cars you can, but on some newer (computer control) cars is not recommended. Some newer cars will turn off even if the alternator is working good. Use a volt meter to test the voltage. Connect it to the battery and it should read a little above 12 volts when its off and 13 to 14 volts when its turn on. If the voltage does not go up, then the alternator is not charging.
Wiki User
∙ 9y ago
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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.
I have a 2003 Chevy impala how do i know if i have a bad battery or bad alternator?
To test the alternator if funds are low, let the motor idle and remove the negative battery cable, if the motor dies its probably the alternator.
How can tell if the battery is bad or the alternator?
Take the battery to a parts store so they can test it.... Actually you need to test both the battery and the alternator because if your alternator is not functioning correctly it can drain the battery of power... so just testing the battery may only tell you that you have a drained battery and not reveal the cause... This testing can be done using an Auto meter which tests the battery and also does an alternator load test...If you do not have a tester you can rent one from an auto parts store,or you can remove the alternator and take it to the auto parts store and have it bench tested along with the battery...usually for free...
How do you check for a bad alternator?
Start the car and disconnect the negative battery cable. If the car dies, the alternator is typically bad... but, to be on the safe side, take it to your local parts store, like Autozone. they test them for free, and will leave no mistake about it.
Why is my charging system not working if i changed my alternator my battery and changed my fuses on my 1997 Honda accord.?
you might have a short take off the negative terminal and connect a test light to the negative cable then touch the negative post with the other end of the test light if the light goes on u have a short
My battery will not hold a charge with a new alternator?
Here is a test u can do to see if Ur alternator is good or not . when car is running disconnect the negative battery terminal it's the black wire.If car stalls then the alternator is bad if it doesn't stall then it's Ur battery is bad and u have to replace it
Dodge avenger battery dead?
Charge it, replace it,test the alternator,Charge it, replace it,test the alternator,
Why is your sts still reading 11.9 battery volts?
It could be the battery or the alternator. Take it to an auto parts store and ask them to do a test of your battery and alternator. Most large auto parts chain stores will do this for free.
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.
Why might a car not start after installing a new battery?
AnswerWithout buying expensive test equipment, you can test it by replacing the questionable part with a known good part.Answerdid you have the new batt.tested where you bought it?you can get a bad batt.off the shelf i know. starter draging.just went though this myselfEven though its a new battery, it may be the alternator!! the easiest way to check it is to get it started when running, take the negative cable or black cable off of your battery if it stays running your alternator is fine if it dies the alternator is bad!! the alternator helps keep the battery charged and going!!
How do you tell if it's the alternator or battery?
Have a shop load test the battery.
I have a 1995 f 150 alternator is good but the battery will not charge what do i need to do?
Charge and load test battery- it may be not able to take a charge and need to be replaced You may a have blown fuseable link preventing alternator from charging battery
