Hi, my 90 suburban's back up lights won't come on. Everything else works. I traced the green wire to where it conects to the firewall in the engine compartment (then it goes through the wall and somewhere onto the fuse box... I think). I nicked off some insulation on that wire and if I put 12v on that wire they light up. I don't know two things: what fuse controls the back up lights? (non of them are burnt...) I just want to keep checking for continuity where is the neutral switch on the steering column? I would love some help before I just hard wire a light on the back to a switch on my dash!:grrrrrr: I will post the solution in the end.