Back in the day you could jump start a Mustang with a small 6' jumper wire and a screwdriver. No inside the car hood release. They had 1 relay coil terminal and an internal ground. Some time later they went with 2 relay coil terminals. I suppose you could use ign switch start on one terminal and neutral/park ground for the other terminal. However, this is a bad idea. The Furd solenoid is a high current device. The relay coil requires many amps which could fry the neutral/park switch.
Stay with the dependable Mopar set-up.
