If it was an option the harness is between the cab and the box. The harness is all taped up about 12" in length. You have to crawl under the truck to find it. If the 5th wheel harness was not optioned you will have to use the rear trailer harness that is standard equiment. It is located at the rear of the spare tire or tucked above depending where the truck was made. Good luck Kirk fe6fc
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