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
AUTOMOTIVE REPAIR CONTRIBUTOR
54,178 POSTS
It sounds like your headlight control relay has gone out but to be sure lets run a test using this guide which will confirm the issue. Here is the headlight wiring diagrams so you can see how it works and the relay location. Check the fuses as well