My vehicle is a '71 SWB, neg ground, 2 1/4 petrol. When I crank the engine to start it, It will ONLY START when I RELEASE THE KEY. Makes it hard to know when the engine is "ready" to start. It's probably a mis-wiring of the ignition switch, but a picture or drawing of what goes where would be very helpful. The schematics don't help. HELP!