I've been fighting with my dad's challenger for a month with no headway... Problem occurred coming home from a cruise, he said the car just lost power and backfired. Just like you reached down and turned the key off.

The car will not start. 1970 Challenger fitted with MP electronic ignition... I can turn the motor over by jumping the starter relay under the hood but will not turn over with the key. The main red wire to the ignition switch is hot when on the off position but loses voltage when on the run or start position.

Tried a new starter relay, new ignition switch, different MP orange box, jumped ballast resistor, even went as far as changing under dash wiring to another used one we had, no change in problem...

What else could this be? Fusable link? I didnt figure so because of voltage in the off posistion.