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Replaced the alternator and it still is not charging

Tiny
JEFF BOGGESS
  • MEMBER
  • 1994 LINCOLN TOWN CAR
  • 4.6L
  • V8
  • 2WD
  • AUTOMATIC
  • 150 MILES
It was replaced with a brand new alternator. Just makes the second one and the car is still not charging. What else is there that would cause the alternator not to charge?
Thursday, January 30th, 2020 AT 5:53 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Hi,

I attached a picture of the charging system wiring schematic. There are two things I need you to check. First, check the J fuse in the under hood fuse box (circled in pic) and confirm there is 12v power to the black/orange wire to the alt.

I circles two fusible links that have to provide power to the alternator. These links function as a fuse, but look like a regular wire. If they fail, the alt will not work.

Also, here are a few links you may find helpful:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-a-car-fuse-works

https://www.2carpros.com/articles/how-to-check-a-car-fuse

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Let me know what you find.

Joe
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Thursday, January 30th, 2020 AT 6:13 PM

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