This is doing my head in. I have a fault on my headlights (they're not working) have checked the basics bulbs, fuse, plugs all good then I checked wiring loom stripped all the headlight apart to check all cables that go up inside and around headlight cluster, still nothing. It would appear that I have power at fuses (high and low) through switch, I have power at multi plug and at headlight plug but as soon as I plug a bulb in the power goes so nothing works.
My question is, is there something else in the circuit that may have failed, relay or similar that I am missing to check.
I do have a wiring diagram but not fully understanding what's going on, I'm used to starting at a power source and following from there but that doesn't seem to work for auto electrics (basic knowledge).
Any help much appreciated