When connecting a utility trailer to truck it keeps blowing the 20 amp fuse.

Thank you for your response. I had the wiring harness replaced today as well as the lighting. The fuse blowing occurred the same way with the old and new wiring. Anything else to consider that I may have missed?

Mismatched wiring between tow vehicle and trailer is the only thing it can be if no short circuits are present! .. If there were a problem (short circuit) in tow vehicle wiring.. Fuse would blow without trailer wiring hooked up... For an easy quick test... You can try hooking trailer to another tow vehicle.. OR .. Can try hooking tow vehicle to another trailer! .. Trailer wiring is universal for ALL vehicles... e.g., > U-Haul trailers.. > [Hint Hint]