I’ve been changing the twin 7 pin Towbar sockets to a 13 pin as that is easier for the various things I connect to the Towbar. All gone fine save for one thing. I no longer have rear fog lamps on truck when I switch them on. But I do have fog lights on the trailer light bar. When I dismantled the 7 pin 12N I found an 8th terminal with 2 grey wires connected to it. The 8th terminal didn’t have a corresponding pin in the plug. It seemed to be connected by a brass strip to the fog light pin. I left out the 2 grey cables when I reassembled. Now wondering whether I should connect them to the fog light pin in the 13 pin. Before I start messing around with a multimeter, anybody have any thoughts? Below is a picture of the old 7 pin 12N - you can see the extra 8th screw terminal and the brass connector. running to the fog light pin. Thanks.