Please explain "start" circuit to me

RedFish said
Now you know a ballast resistor can fault in 2 ways, either burned to open circuit or to grounded circuit through the firewall or its mounting bolt.

I need to study this ballast resistor a bit to learn more about how it functions.
The mounting screw goes through the center of the ceramic block, so it is completely insulated from grounding to the body. On the back, one resistor coil is embedded in ceramic, so I can't see how it is constructed (time for a hammer). The other resistor (suspected bad one because of the soot) is a ceramic rod spanning across the gap with a very thin wire coil wound around the rod. I need to see if the "start" circuit goes through the exposed coil or the embedded one.

Get Aaron a spare to keep in the glove box.

Funny, that's where we got the one to swap them out. He had one in there, but we didn't equate the "diagnosis" to the "symptoms". Again, word was that the car would start with a bad resistor, just not run. #-o

Anyone have any pics of this interlock plug and it's location as well as the "Red Button"

I'll try to do that this weekend. I believe this was a '74 one-year-only system.