New battery will not charge?

1999 PONTIAC SUNFIRE
20,045 MILES
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PAT VARNER
  • MEMBER
  • 1 POST
replaced motor with one out of a Cavelier in my car listed above, the Cavalier was manual and mine is an automatic. The battery is new, the alternator is new, and the starter is new. It will start and run but battery drains after driving for a while and need charged it shows 13.5 at the battery when running.
Oct 20, 2023 at 12:08 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

When you checked the alternator voltage, did you have it loaded? Also, does the alternator light ever turn on while driving?

If the battery is fully charged, will it fail if it sits overnight without being run?

Let me know. Also, take a look through this link, you may find it of interest:

https://www.2carpros.com/articles/car-battery-dead-overnight

Also, when you installed the engine, did you keep the automatic transmission that came with your vehicle?

Let me know.

Take care,

Joe
Oct 20, 2023 at 4:04 PM
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