Ding ding ding... We have a winner!
Yep, the dreaded ignition switch- happened to me....twice
when you replace the switch, please take notice of the wiring around the connector. the insulation over time will become brittle and deteriorate. When I replaced Cup's ig switch the first time, it was the switch itself. the second time, it was due to the wire insulation on the ig switch connector. this caused a short, and crapped out the ig switch. You can put liquid tape around the wiring, or JB waterweld- an epoxy putty with insulation properties, BUT it's best if you can get it rewired with better wiring (at least 6 or so inches of wire, not the whole harness) or find a replacement connector from a salvage yard.
Remember to check the wiring as well as replacing the switch.
And a big ditto on what Stephen said
All the best
