I was just under mine yesterday cleaning the connection on it. Was wondering what it is for. Looks as if it connects the coach batteries to the alternator for charge. Is that right? I looked at the Rock Auto link and it looks different than none. Mine looks more like a GM starter mount solenoid. A little bit of trivia, but Studebaker used the same Ford style solenoid. That means, I have spares, both new and used. Leaving for Grapevine TX soon, so a Stude solenoid will be in the travel kit.
Many thanks from the two of us!
Kevin and Cara
God Bless America!