Forum Discussion

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....
Harvard's avatar
Harvard
Explorer
Aug 18, 2019
Sounds to me like the Brake Controller is wired incorrectly.
Maybe the Ground Wire of the Brake Control Module is connected
to the wire that goes to the Park Lights.

With the Park Lights off the Brake Controller gets its
0 VDC through the park light bulbs to Ground.

When the Park Lights are turned on there is no
0 VDC for the Brake Controller.

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