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Discussion Starter #1
Just bought the truck.
Never had hitch it brake controller installed from factory.
Installed hitch and brake controller and rear plug and play 7 round plug.

When trailer hooked up the marker lights are energized with blinkers.
also my brake controller indicates the trailer is not hooked up and won't energize the brakes.
under the dash adapter is first picture.
rear of truck is second picture.
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Two things come to mind. First, it's incorrectly wired and second, you have a bad ground. Trailer wiring faults like a bad ground or an incorrect bulb installed in a tail lamp for example can also be a problem. Also keep in mind that the actual connector (adapter) that the trailer plugs into can have opens and shorts due to water intrusion and corrosion. I suggest verifying the trailer connector is wired correctly and go from there. There are wiring testers that plug into the trailer connector that provide an easy visual verification that the circuits are working correctly and test the functionality of the trailer brake controller - example ---> Trailer Wire Emulator


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