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Battery light on It needs a jump to start and then runs a bit rough?

Tiny
BHAMDOC1973
  • MEMBER
  • 2010 FORD F-150
  • 4.6L
  • V8
  • 4WD
  • AUTOMATIC
  • 232,000 MILES
It needs a jump to start and then runs a bit rough, not sure if related to the alternator. Once I check the battery voltage and charging voltage, ig I remove the alternator is there a way to check the connector behind it to see if am getting what I need to get? If so, what wires should have power and what need ground?
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Wednesday, August 14th, 2024 AT 7:49 AM

4 Replies

Tiny
BHAMDOC1973
  • MEMBER
  • 1,542 POSTS
I checked the charging, and it says 13.50. Battery is from 6/20.
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Wednesday, August 14th, 2024 AT 2:19 PM
Tiny
KEN L
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  • 47,126 POSTS
The battery is almost five years old so I would say it is bad. You can remove it and head to an auto parts store for testing or you can use this guide:

https://www.2carpros.com/articles/car-battery-load-test

Here is a guide to help you test the alternator:

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

Here are the alternator wiring diagrams so you can see which wires go where. Check out the images (below). Let us know how it goes.

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Wednesday, August 14th, 2024 AT 4:20 PM
Tiny
BHAMDOC1973
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Not solved yet. Changed the battery but I still have a battery light and the charging is over 13.
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Saturday, August 17th, 2024 AT 2:07 PM
Tiny
KEN L
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  • 47,126 POSTS
It sounds like you need to do a battery monitor reset.

Here is a guide to help:

https://youtu.be/ETNv2S_idIU?si=BZPj8NUX1Wicemd-

Also, have you run the FCAN scan?
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Monday, August 19th, 2024 AT 8:45 AM

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