Troubleshooting Trail Lite Cruiser Running Lights Blow Fuse on Truck

Updated 07/20/2017 | Published 07/18/2017

Question:

Have a 2012 Yukon XL Denali pulling a 30foot Trail lite Cruiser TC-30qbss trailer. The tail lights work both blinkers and brake lights work. When you turn the running lights on they flash then the vehicle fuse blows. When we unplug from the vehicle and jump a wire from the trailer battery +post to running light wire green the running lights work. Back to vehicle blows fuse every time. Camper trailer 7 way setup. Vehicle side 7 way. 1 white ground 1 white ground 2 blue brakes 2 blue. Brakes 3 green Running lights 3 brown Running lights 4 black battery charge 4 red/black battery aux 5 red stop/LT signal 5 yellow. LT/stop 6 brown stop/RT signal 6 dark green RT/stop 7 yellow auxiliary 7 light green backup lights So as I said everything works except running lights.

asked by: Jeremy F

Expert Reply:

It sounds to me like you have a short somewhere on the Yukon's trailer wiring. Either that or the draw from the lights on the trailer is just too much for the truck to handle.

Start at the Yukon's 7-way and make sure it's clean and free of corrosion. Both on the front and back. Then follow the wiring into the truck looking for any damaged or pinched wires. If when you connect the jumper wire to the trailer you're not going to the connector inspect and clean it as well.

If you still can't find the issue let me know and we'll keep troubleshooting.

expert reply by: Charles S