Hello again, please can anyone help as I have spent a whole day checking and rechecking, all lights on car working fine, just fitted tow bar and electrics with bypass, all indicators and brake lights are fine on connection ( using light up 12v screwdriver type tester), but main lights and fogs don't seem to be working at towbar, I followed all instructions as in the paper work and video provided (utube link) I am waiting for a proper plug in tester to arrive but my limited knowledge is used up, by the way the fogs have been fitted with the two wire connection of cutting main wire and feeding two to relay, that's about all really thanks paul