Hello, Trying to fix up my first ever Ford. 1994 F350 7.5 First hurdle I've come across is that I seem to have broken one of the studs off of this device to the right of the starter solenoid. What is it exactly?
Looks like it is some sort of ancient rely. It is providing power to a device called a brake trailer brake synchronizer. https://www.hayesbc.com/products/controllers/syncronizer/
Sorry, I took a break from here for a while. Self reset circuit breaker. 15 - 20 - 30 amp models. They still sell those.