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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....
enblethen's avatar
enblethen
Nomad
Aug 18, 2019
Try pulling the brake lamps in the trailer. It could be a bad filament shorting to the tailight filament.
Test trailer with jumper wire from trailer battery to light functions. Look for anything odd in lighting.

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