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.
Yes, sorry, I was pushing the limits of "RV" with a boat trailer, thanks for replying. I did get an adapter from Curt that claimed to solve this issue but unfortunately did not. It DID make the difference on the temporary light system, as the initial 7-pin/4-pin adapter didn't even do that. Can I ask what adapter unit you had success with?
