Factory Trailer Brake Module

By camster17
May 23, 2009 in Ask A GM Technician

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camster17

Posted May 23, 2009

I'm installing a gooseneck hitch on a 2007 GMC 2500HD 4X4 diesel. The hich gives me a braket to relocate the factory brake control relay. When I looked at the relay I see that it is in turn bolted to a large steel plate (maybe 6" X 10") that seems to have some kind of electronic "box" fastened to it and the wiring harness is also plugged into this component. The steel plate is bolted to the inside of the frame but the bolts don't look like factory. This plate is in the way of installing the hitch plates. Does anyone know what this is? Is it factory or after market? What is it for?

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