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Should Trailer Wiring Have the Running Light Circuit Always Activated  

Question:

Should the running light pin stay on even when the truck is off? I run a test on the posts and the running light post is the only one that stays on.

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Expert Reply:

The only time the running light circuit of trailer wiring should be on is when the headlights or running lights of the vehicle are on. You might have a shorted trailer wiring converter box or a bad relay if the trailer wiring is factory.

I attached a help article on troubleshooting trailer wiring installs for you to check out as well.

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Jameson C

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