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Battery light on my alternator is making 13.6 volts

Tiny
LAKERHATER4
  • MEMBER
  • 2000 FORD WINDSTAR
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 138,000 MILES
My alternator is making 13.6 volts DC. When I turn on all lights and A/C it goes to 13.5. I did this at idle without increasing rpm. Do I need another alternator?
Monday, July 5th, 2021 AT 12:57 AM

1 Reply

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

The charge rate should be 14 to 14.5 volts. That low voltage tells me it needs to be replaced.

https://www.2carpros.com/articles/how-to-replace-an-alternator

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

I attached the wiring diagram for you and the procedure.

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

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

Roy
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Monday, July 5th, 2021 AT 1:58 AM

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