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Trailer Right Turn Signal Does Not Work When Connected to 3 Different Vehicles

Question:

Right turn signal will not work on trailer. Tail lights are good. I have the t1 harness with the converter box in middle. I tried the trailer on another 95 ranger with the same connector. Same problem. Tried the trailer on a 2005 Ford Escape factory installed wiring harness. Same problem. Can all 3 be bad?? Also tried a ANOTHER trailer on all three vehicles had the same problem right turn signal not working. Can all 3 vehicles be bad??? I used a test light on the 2 rangers with converters on them. Tested the OUT sideCould not get a signal on the right side going out but good on the left on both cars. I didnt test the Escape being it was factory installed. Is it possible I blew both converters on the Rangers and whatever on the Escape?? I am CONFUSED!! Do I have a short somewhere on the trailer causing this problem originally then messed up the other 2 vehicles? Nothing makes sense. Any help WOULD be Gratly appreciated.

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Expert Reply:

It certainly does sound like a short on the trailer that caused some problems, but I would not rule out the possibility that it is just coincidence and that there is an issue with all the vehicles in some way, shape, or form. If the trailer draws more that 2.1 amps per side for turn/brake lights then that would cause the converter to blow.

On the trailer, make sure its connector is free of corrosion. Then you will want to trace the wiring leading back from the 4-Way to determine if there are any nicks with the wire exposed that is touching the metal trailer frame. If there is then that would be causing a short.

Also you will want to make sure that all of the trailer lights and main trailer ground are attached to clean and corrosion free bare metal surfaces. I have included a link to an FAQ article and a video that will help you troubleshoot the converters.

On the vehicles you will want to check any fuses and relays related to the tail lights to make sure nothing is blown on the vehicle side of things.

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