Mercedes/Trailer Lights Compatibility Issue
Hi all, I'm having a strange electrical issue and would be grateful for some advice. We recently purchased a used boat trailer and a 2020 Mercedes GLS 450 suv to tow it. The Mercedes has a 7-pin ...
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Not sure what this has to do with RVs. Assuming you're coming here in case someone has a similar issue. I had the same problem with my Mercedes based motor home and LED wireless lights on our toad. Tow lights require a certain voltage. The Mercedes equipped with LEDs sends too little voltage to the trailer wiring harness and they don't behave as a result. Sounds like you need a resistor adapter. It will trick your trailer lights into getting the proper voltage to work. Worked in my case anyway.
Seems a very related issue to RVs and an articulate question to boot.
Do you think wired LED trailer lights, assuming the OP or yours were incandescent, would solve the problem?
The lights are a mixed bag.
The original trailer lights, which would only illuminate continuously, were incandescent.
The clip on light system is incandescent and works.
The trailer retrofit lights are LED for the signal/brake lights (the installer left the existing incandescent running lights in place) and will not blink but do illuminate.
I think that's your problem. Leds and incandescent require different power. Your car's ECU can't send 2 different signals.
I know what you mean. However the guy who installed the new lights on the trailer tested the LED's alone before connecting the running lights into the system, and it was the same deal, solid illumination but no blinking, while the Tesla was able to work correctly. Not clear to me why can my Tesla handle that setup but the Mercedes can't. Too bad my Tesla can't pull a 5000# boat trailer combo!
Do you happen to know the name/model of adapter you had success with on your Mercedes RV?
