Hello, I just got a 2007 Sprinter that appears to have the factory OEM module. I have tried to get it to work on a number of trailers, but every trailer gives me a different outcome. I have tried 3 different 7-way to 4-flat adapters on each, with the same results:
Trailer 1 (6x12 enclosed -regular bulbs): Brake works, left and right signals flash normal, but no running lights
Trailer 2 (5x10 open-regular bulbs): Brake works, left and right signals flash normal; no running lights, but right running lights flash same as the right turn signal
Trailers 3,4,5,6 (boat trailers, some with LED lights, most with regular bulbs): Didn't have someone to check brakes, left and right signals do a rapid flash (one super-quick flash every time the turn signal turns on), no running lights
I have measured with a voltmeter (with trailers connected) and never get any voltage out of the running lights pin.
Any suggestions what I can do to resolve this?
If your recommendation is to change the trailer module, can anyone confirm where it is located? I have seen some documents that say it is in the rear of the vehicle, and others that show it is under the drivers seat (see attached image - is that the location of the module?)
I also have a 20A fuse in position 14 (manual - "Trailer Socket") and a 25A fuse in position 15 (manual - "Trailer Recognition Device"). Do either of those mean I have Trailer Stability Assist?
I know some of these questions have been asked before, but I have never seen a resolution. Is there a troubleshooting guide for OEM trailer wiring?
Trailer 1 (6x12 enclosed -regular bulbs): Brake works, left and right signals flash normal, but no running lights
Trailer 2 (5x10 open-regular bulbs): Brake works, left and right signals flash normal; no running lights, but right running lights flash same as the right turn signal
Trailers 3,4,5,6 (boat trailers, some with LED lights, most with regular bulbs): Didn't have someone to check brakes, left and right signals do a rapid flash (one super-quick flash every time the turn signal turns on), no running lights
I have measured with a voltmeter (with trailers connected) and never get any voltage out of the running lights pin.
Any suggestions what I can do to resolve this?
If your recommendation is to change the trailer module, can anyone confirm where it is located? I have seen some documents that say it is in the rear of the vehicle, and others that show it is under the drivers seat (see attached image - is that the location of the module?)
I also have a 20A fuse in position 14 (manual - "Trailer Socket") and a 25A fuse in position 15 (manual - "Trailer Recognition Device"). Do either of those mean I have Trailer Stability Assist?
I know some of these questions have been asked before, but I have never seen a resolution. Is there a troubleshooting guide for OEM trailer wiring?
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