LED Trailer Lights Not Working when Towed by 2007 Mercedes ML350

Question:

I have a 2007 Mercedes ML-350, and trailers with normal lighting, and 1 with led lighting.. Will this adaptor work on both trailer systems?? Ive tried others, and nothing works.. All trailers are 4 pole, flat, and car is 7-round

asked by: Tim P

Expert Reply:

Since one of your trailers has LED lights and you are towing with a 2007 Mercedes ML350 I recommend using adapter # C35FR. It will work with trailers that have regular incandescent lights too.

This adapter has built in load resistors that simulate more power draw from the trailer lights so that trailers with LED lights will not confuse the tow package wiring system on your Mercedes.

In some cases, the load resistors in the adapter are not enough. In those cases additional load resistors can be added to the trailer, in line with the wiring. For a single load resistor you could use # DI34ZR.

expert reply by: Michael H