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Battery light will not go off stays on all the time

Tiny
CRAZYKB
  • MEMBER
  • 2003 FORD WINDSTAR
  • 3.2L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 270,000 MILES
Battery light will not go off stays on all the time. Alternator checks out good. I was told it has an external diode, but cannot figure out where it is located. Can you help?
Thursday, October 19th, 2017 AT 3:46 PM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
What is the battery voltage when the engine is running? It sounds like the alternator is bad but to be sure lets test it by following these videos and guides.

https://youtu.be/Z-p4dMJUpUw

and

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

Let us know what happens and please upload pictures or videos of the problem.
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Thursday, October 19th, 2017 AT 4:14 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,464 POSTS
No external diode in the system I can see. The charge indicator circuit feeds back system voltage to turn off the light. Check the fuses and the fusible links.
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Thursday, October 19th, 2017 AT 5:54 PM
Tiny
CRAZYKB
  • MEMBER
  • 1 POST
Alternator is new not a re-manufactured. But it was bad I got another unit worked perfect thanks for your time.
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Friday, October 20th, 2017 AT 3:05 PM

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