Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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STRAILER
CAR REPAIR CONTRIBUTOR
54,189 POSTS
Here are the wiring diagrams as you have requested but I don't think they will have anything to do with the car overcharging the alternator. This guide can help you test the connections: