Hi, I have just had a towbar fitted to my 2.0ltr Ghia Cmax and the guy took out the panel, which looks like a cubby hole, and fitted the wiring to an existing 12volt socket. It means that when I am towing and have the fridge on, I cannot plug anything into the back 12volt socket but I can use it when not in towing mode. He also fitted a relay to the same loom as I was concerned there may be a cam bus on the Cmax. Apparently there is one fitted but it is not affected when attaqching towbar electrics.