They incorporate seven electrical circuits having a uniform color-code, with the positions in the connector marker accordingly. ... 10 wire. The color-code is vehicle ICC required mi clearance lamps Left-hand direct nal lamps nal lamps Tail lamp, three-har marker lamps ... Div., 7-way ATA tractor-trailer connection plug and receptacle. while trailers that remain unchanged can still be coupled to the old pluganbsp;...