My truck won't start. I turn the key, and it clicks once. I tested the battery, it's fine. I checked the wiring, and found a spot where it had been a little melted by the exhaust manifold. I replaced the wire with a new one, and the same problem: one click. Can I have someone try to start the car and lightly tap the starter solenoid? Or is there a way to hook up jumper cables to it directly? Bridge the gap with a key? Any help would be appreciated.