Troubleshooting Blown Fuses When Trailer Wiring is Connected

Question:

I was working fine for three four months bur now every-time y do plug in the trailer my fuse get burn some time work fine if it work fine and them I make a turn and the fuse goes out the original light bulbs are incandescent but I did add leds but it was working fine since the beginning .

asked by: Jaime

Expert Reply:

Blown fuses from trailer wiring are due to either a short somewhere on the trailer wiring circuit or that the trailer is drawing too much amperage for the circuit. Since you said you installed LEDs it would seem unlikely that it's drawing too much.

Make sure that the trailer side connector are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.

expert reply by: Jameson C