Originally Posted by ttpete
Actually, the solenoid just shot the full 12 volts to the coil when it engaged the starter. The resistor was elsewhere.
You are correct, and I was wrong on the "R" terminal.
The "R" terminal on the solenoid is for Resistor by-pass
The resistor that GM used on point ignition systems was, the unique resistance wire they used from the ignition switch to the coil.
Benesesso could probably explain the use of different alloys used in making wire that would create resistance and not get so hot as to turn into a toaster oven and melt the loom.
I'm trying to remember back 40 some odd years ago and, nichrome comes to mind as the type of wire GM used.