Battery light will not go off stays on all the time

2003 FORD WINDSTAR
270,000 MILES • 3.2L • 6 CYL • 2WD • AUTOMATIC
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CRAZYKB
  • MEMBER
  • 1 POST
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?
Oct 19, 2017 at 8:46 AM
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CARADIODOC
  • ✓Experienced Mechanic
  • 34,388 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.
Oct 19, 2017 at 9:14 AM
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STEVE W.
  • ✓Experienced Mechanic
  • 15,358 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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Oct 19, 2017 at 10:54 AM
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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.
Oct 20, 2017 at 8:05 AM
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