ignition switch?

I have replaced the relay, neutral safety switch, ignition, starter 3 times, Alt. reads strong discharge when I crank but does not turn over. Leave the key on and jump the relay with a screwdriver it starts just fine. I'm gonna start replacing wires on the inside next. But which ones????:banghead:

Rather than just guessing by throwing parts at it get a multimeter and run some voltage checks. It's a whole lot faster and cheaper. Since you replaced all those parts it's probably in the wiring. The bulkhead connector on the firewall is a trouble spot on old cars. The connections get corroded and don't make good contact and cause all kinds of problems. I'd check that first and if you find no problem there since your able to jump the relay and it starts it's probably either the relay isn't getting B+ to it when you turn the key to start or the neutral switch signal ground isn't getting to the relay. Hook a multimeter up to the yellow wire going to the start relay and turn the ignition switch to start. You should read battery voltage. If not the problems in the yellow wiring somewhere. Next check would be to pull off the brown wire on the starter relay and make sure the car is in park and turn the multimeter on ohms X1 scale and test from the brown wire to ground. It should be 0 ohms or really close.