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Activating 12 Volt Power Circuit of 7-way on 2010 Mercedes GL450


The Curt part C57003 allows the trailer lights to work correctly on a trailer with LED lights however the info screen in the vehicle still says the trailer lights are not functioning. I can live with that. The next issue is that the 12 volt hot line in the trailer plug is not functioning on this vehicle. Is there a fuse or relay that must be installed to get this function to work?


Helpful Expert Reply:

Not every vehicle has the 12 volt circuit completed from the factory. If you look at the connector is there a wire that runs to the 1:00 pin position? If so, that would indicate maybe a relay or fuse is needed.

Or if not, (or if you just want to bypass all of it and have a direct solution), you can run a length of 10 gauge wire like part # 10-1-1 to the positive post of the battery through a breaker like part # 9510 and the circuit will be active.

helpful expert reply by:
Jameson C

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