[Classic Heartbeat]

Your ignition switch gets it's power from the fuse box.
The fuse box gets its power from the forward lamp harness. The main power wire will be the large red wire that comes out of the end of the harness on the right sidebehind the battery. That wire is supposed to be a fusable link. It may have gone bad. It should be bolted down to the right front fender lug next to the battery. Either check to see if you have 12 volts coming just beond the fusible link or check it at where the wire plugs into the back of the fuse panel on the firewall.
If you have power there, then the problem could be the starter switch. Before you change the switch you need to rule out the wireing between your fuse panel and your starter switch. To do that check to make sure the big red wire going into the back of the starter switch has power. It should have power all of the time, not just when the key is on.
If you have power there then the switch is the next in line to be tested. With the key in the "Start" possition test the purple wire plugged into the back of the ignition switch. You should have 12 volts there. That is your starter wire so there is only power there when the key is in the start possition. (If no power to the purple wire, then you have a bad starter switch)
If you have 12 volts there, then test the purple wire in the engine harness where it plugs into the fuse panel on the engine side of the firewall. This will take a second person, unless you have unusualy long arms..lol
If you have power there with the ignition switch in the start possition, then test the purple wire it hooks up to the starter solenoid.
If you have power there and your engine still doesn't turn over you may have a bad starter solenoid.
If I missread the post, then disreguard this message... WES