Battery keeps getting drained and car shuts off while driving

Tiny
KURT PEEZY
  • MEMBER
  • 2003 PONTIAC GRAND AM
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 283,000 MILES
Just replaced my spark plugs a week ago on my car and accidentally arced out the main cord on the alternator. After that car would not keep a charge and thought I fried the alternator. I replaced the alternator three days ago. I have a battery I bought a week and a half ago and I still lose power while driving. I got the battery tested and it was good. Alternator seems to be working, yet I still lose power while driving. Battery does not last for more then half an hour of driving after I put it at a full charge. Can someone please give me some advice what I should look at next?
Monday, September 3rd, 2018 AT 3:49 AM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

Do you have a voltmeter to do checks at the battery and the alternator?

It sounds like the alternator is not working.

There is a fuse in the under hood fuse block. There is also a fusible link off the starter motor that feeds the back of the alternator.

I attached a wire diagram for you to view. Check the related fuses.

Roy

https://www.2carpros.com/articles/how-to-check-a-car-alternator
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Monday, September 3rd, 2018 AT 5:48 AM

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