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LED Trailer Tail Lights Not Working when Connected to a 2011 Mercedes GL550


My car will not power rental trailers that have LED lights. Do you have an adapter that will power trailers that have LED lights?


Expert Reply:

On many German vehicles such as your 2011 Mercedes GL550 there is a bulb out sensor error that occurs when a trailer with LED lights is connected to the vehicle. This is because the LED lights draw such a small amount of power the vehicle computer thinks there is a bulb out and won't light the trailer lights.

There are adapters designed to correct this problem by using load resistors to draw more power so the system will function normally. You can use adapter # TR20141. It plugs into a 7-Way trailer connector and you can plug in a trailer with a 4- or 5-Way flat connector. I have linked a video review of this adapter for you.

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