[DogMeister]

Originally Posted by tc

Even if I used the ford style, I would have the same question. Using a push button ( to crank, not start the engine, key off ), one wire to the battery and the other wire to the same post ( ford solenoid or relay ) the ignition switch wire is hooked to. Pushing the button would cause voltage in the ignition switch wiring ( going backwards? ) all the way to the ignition switch. Will that hurt the ignition switch or neutral safety switch on my auto shifter? Do I need a diode on the ignition switch wire that triggers the relay?

They make an auxiliary switch that attaches to the Ford solenoid so you can crank it from the engine compartment, ignition on or off. You can also jump the terminals with a screwdriver. People have been doing that since the system began. Never heard of it causing an issue. The current is going to take the shortest route. If the ignition/starter switch is open (not on) no current is going to flow to it.