Got a couple of technical questions about the wiring of the headlights if anyone can help. I'd like to link my main beam to the fog lights such that when you turn on the main beam, the fogs come on too - but not vice versa. On my last car I connected them together at the headlight end using a relay, but I'm trying to avoid that if possible. I had a look at the wiring of the headlight switch but I think it's all done using CANBUS lines (or at least is on the cars with auto headlights) so I don't think I can tap into that? Failing that is there anywhere inside the car that the headlight wiring is accessible? I can't actually work out where the ECU is that controls them.
