no fire,a bit lost....

It should have a harness and I'd get one if it's not there. It runs the backup lights too. I think it plugs into the firewall harness around the wiper motor area. One of the wires from that harness goes over to the starter relay to ground that circuit so the relay will work. You can bypass the neutral wiring by connecting a jumper wire from that terminal on the relay to a good ground. You MUST have a good ground cable from the battery to the engine and a ground wire from the engine to the body. Keep in mind that if you bypass the neutral safety switch, the car will start in any gear. That could be dangerous if you accidentally start it in gear.