A plug tester is about $20... It ranks as the best $20 (whut I paid for mine) I ever spent... It simulates the trailer brakes or the controller thinks the trailer is hooked up... In a mater of a min. you know either its the truck side are the trailer side...http://www.trailerpartsusa.com/products/TK-6562?gclid=CLubxIeL9bYCFSpnOgodSnYAcQ
Simulates load of electric brakes making it ideal for setting up brake controls without a trailer. :wink: :wink:
If a woman drives up its common they did not orientate the trailer connector to the truck,,, most will go (hook up) in even with the key slot out of alignment :shock:
Nutter note,,, I always wire in 12V supply and the back up lights at the rear plug,,, fill'em all up... Its not uncommon to find the trailer brake wired into the 12V supply terminal at the trailer plug... I always stack my under hood fuse side by side so all the owner has to do is swap these to leads at the breaker/fuse and move on with the show if he hooks to a trailer wired wrong...