Apparently, tow bars and their wiring are now part of the MOT and have been for over a year.
Last year it failed so I just took the 7 pin socket off and taped up the wires, nothing there, nothing to test!
Reason, when mine was fitted to my 2003 Mazda 6 the fog light wire was never connected as it's in the tailgate.
Has anybody ever found an easier place to scotch lock into the fog light wire?
