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cbwallace's avatar
cbwallace
Explorer
Aug 18, 2019

Trailer brakes stop working when headlights are on

My Reflection has developed an issue where the trailer brakes stop working when my headlights are on. In the truck I get a Check Trailer Wiring message. When this occurs the trailer brakes don't work....
MEXICOWANDERER's avatar
MEXICOWANDERER
Explorer
Aug 18, 2019
A restricting negative is easy peasy to diagnose

Turn on parking lights, then actuate the manual brake lever on the controller. What happens to the lights on the trailer?

If the circuitry goes "Bates Motel" with the lights on the trailer you gotcha problems with the chassis negative.

Start the exam process by opening the plug and look for the usual suspects.

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