Workarounds If you are NOT using an original Mopar ignition switch, you might have a "situtation." For example, I once had a Chev column in a Toy FJ40 Landcruiser, with a Mopar SB engine. Just like Mopar, "ignition run" goes cold in starting. BUT THERE IS NO "ign2." This function in the Chev was provided by the "I" terminal on the starter solenoid. "What to do?"
There are a couple of ways....................
1.....big isolation diode. using a fairly large diode, you can take the 'start' wire and run from there through a diode to the ignition system. This imitates tying IGN1 and IGN2 together with a Mopar switch, and the diode keeps the "run" line from feeding back into the "start" line
2....Use a relay. This is simple, works well, and there are lots of options. Use the "start" line to key a second relay, and feed the relay switched output back to the "run" line.
3....If you are using a Mopar start relay, there is a later "Jeep" style which has one extra terminal. That terminal can be used for your IGN2 substitute. The disadvantage of this later relay is that instead of using a "square screw for the solenoid terminal it was replaced by a "push on" terminal.
Jeep relay:
Big stud........same as original, a battery junction, and one relay contact
Bottom two flag/ push on terminals........same as original, one is "start" wire, other goes to NSS switch/ clutch switch
Middle flag / push on........goes to Mopar starter solenoid, same as original 'square screw'
Top "flag" terminal up by the "big stud." This is the added terminal, and has a separate contact, which can substitute for your IGN2 connection
View attachment 1715452773
4....Use an AMC "Ford like" special starter solenoid. For a few years, AMC used a relay that was very similar to Ford, but with ONE EXTRA terminal. (5 total) This terminal was used for the neutral safety switch, so what you had on this relay was
1...Big stud to battery
2...Big stud to starter (On Mopar, this feeds the solenoid start wire)
3....small "start" terminal......goes to Mopar yellow start wire
4....small stud NSS terminal.....goes to Mopar neutral safety / clutch safety
5.....small stud "IGN" terminal goes to your ignition run line and performs the bypass function
The weird AMC "Ford like" relay, the NSS stud is at the rear, a push on Ford style connector
View attachment 1715452782
View attachment 1715452783
