1974 Brain Box saves the day.
The 4 pin is the universal. Dont need the 5 th pin even with the dual ballast resistor as long as the 4th pin goes to the .5ohm side and not the 5 ohm side. The 5th pin is only another 12v feed in the run position through a beefy 5ohm resistor. Not sure what the reason for this is. It may be a non interrupted power feed to ecu between start and run positions.
The 4 pin is the universal. Dont need the 5 th pin even with the dual ballast resistor as long as the 4th pin goes to the .5ohm side and not the 5 ohm side. The 5th pin is only another 12v feed in the run position through a beefy 5ohm resistor. Not sure what the reason for this is. It may be a non interrupted power feed to ecu between start and run positions.
