all the lights are working until the breaks are pressed then all lights go out Truck ford f150 and duckman camper pop up
asked by: Sharyl M
It sounds like you have a common ground problem. When the brakes are applied and the brake lights are illuminating, the highest amperage draw is placed on the wiring system and if you have a bad or loose ground, you will have problems with lights. You will want to inspect to make sure all the light assemblies have a good clean ground connection to metal that is free of rust and paint.
You will also want to make sure the trailer and vehicle side connector have a good ground connection. Inspect the connectors and make sure no corrosion is present inside the connectors. If corrosion exists, you will want to replace the connectors.
I would recommend unbolting the ground connections, and cleaning up the metal or relocating the ground connections to a clean metal surface. This will ensure that any grounding points are good to go and not bad.
If you are using a plastic license plate holder on the left side tail light, this could also be causing a ground issue and you will want to make sure the mounting bolts are making good contact with the trailer frame.
I have linked an FAQ on wiring which also has information on ground problems.
expert reply by: Reno H
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