The wiring is behind the carpeting. It is not standard wiring, as the system operates on voltage differental, not separate filaments. It only uses one filament. Find a dedicated adapter and install it. This may be a job for a pro.
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IF you have this trailer with this vehicle before the problem will probably in the wiring in the plug. Loose broken or corroded away. Check condition of the light sockets and earth points and wiring back to the plug
Hook up the trailer to the vehicle. Under the rear bumper you will find a thick wire harness that runs from left to right or vica versa. Choose a location to strip open the harness to gain access to the different color wires. Open the trailer coupling. remove all wires and split them apart. Now start with say the right indicator light on the vehicle. Earth should be established via the grounding method of the trailer hook steel on steel of the vehicle. Connect any wire of the trailer to the now flashing right indicator light. Go through them all till the right indicator bulb flashes on the trailer. A good approach to determine which wire is active, is to make a test light from an old bulb connector some have already two wires connected ie; pos neg. neg the tester onto any part of the vehicle chassis and the pos to the now live wire. Go through them all till all wires meet up. Now go on and extend the harness by means of soldering properly and insulating that wire from the main harness to the female fitting of the trailer connector. At each connection on the fitting fit on properly the different wires and do the same to the male connector from the trailer so that all lines up inside the two connectors. Good luck
Hello Rodney,. This is a good one.. yet I hope to never cease to be amazed!! Not really sure, but perhaps the below will provide some answers or lead you in the right direction, if you haven't already ventured there yet...
Is there something new on this connection, like the connection itself?
Follow the wires to confirm the correct connection? Dealers carry schemata at the parts department, typically they can make a print out for you.
This is the same trailer or does with all trailers? (may be mixed or short in the trailer wiring?
The interior of the connector has been examined for any crossed or otherwise shorted/ loose wiring?
silly as it may seem, what about the brakes on the trailer? All lights on the trailer working good with secure connections?
Let me know how you make out. Perhaps try another post here to see if the general public has any other response?
Hope this helps! Let me know how you make out, this one really has me wondering...
It does sound as though the trailer connection is the source of the problem, check to see if the wiring has been resting on the exhaust pipe and melted through, shorting the wires. Also check if it is squashed or damaged anywhere. Failing this you may have to pull the trailer connector apart and see if the wires have come out inside and are touching, this can happen if the trailer connector is pulled hard.
Is this wire a ground wire from the trailer or is this a wire for the trailer? If you are wiring a hook up for your trailer to plug into, that should be a ground wire and can be hooked up to any good solid metal part of the car. This can ground to the body, chassis or bumper. If you are looking for a wire to hook to, then look at your tail light socket and see which wire goes to the metal base of the bulb, that is the ground wire.
have seen this a few times on fords. I'm assuming it only blows when you use the trailer. then the only cause can be a shorted wire somewhere between the trailer connector to the lights at the rear of the trailer or maybe the light assembly is bad. If the problem happens when you have no trailer hooked up then inspect the trunk harness. and wiring under the bumpers. Something 12v got pinched.