Cummins n14

[PeteMelb]

Not sure if this helps you or not but one of the trucks I have is an older International that has an M11 motor in it with a very basic ECU and I have the same Inline gear you have, the M11 truck has a two wire plug (possibly like the one you described but mine is in the cab) I made a connection from the two wire plug into my inline adapter but I also had to add a 12volt power wire from the truck, I did this by adding a cigarette lighter adapter to the connection I made, you may need to add power to yours. But I can't stress enough make sure your on the correct plug and lack of power is your problem and don't short anything out!!