charging system not working alternator wiring?

2005 LINCOLN NAVIGATOR
90,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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PACER MILLER
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  • 1 POST
My check charging light came on just before vehicle shut off. Replaced battery, replaced alternator, checked fuses and inline fuses connections. still will not charge battery.
Nov 12, 2017 at 5:48 AM
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KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
There are a couple things that can cause this. We need to start with making sure we load checked the alternator using this guide.

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

If this is how you tested it and it passes then we need to find out what the voltage is on the two wires going to the PCM.

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

Basically if the alternator is being commanded to full charge then we just have an indicator issue.

This is a bus message from the PCM to the cluster. Here is a guide that will help with this system:

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

I am attaching the info below from the manual on the wiring diagram and let us know what you find with the voltage and we can go from there.

Thanks
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Sep 13, 2021 at 9:11 AM
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