I wired up an overhead computer in my truck tonight and can't get the damn thing to even turn on. I've checked all the wires a good dozen times and everything is right. I get nothing at all when I turned the truck on. I have the power line ran to the #11 fuse and the ground is good. The CCD wires are taped into the OBD port. I don't have the temperature sensor wires hooked up yet but I wouldn't think that would prevent it from turning on. Any ideas?