Spent the day working on the truck, still no joy.
I have a basic starter question. With the starter removed and the frame grounded, should +12v to the S terminal spin the starter motor, with no power to the B terminal, or does that indicate a short in the starter?
When I tested the starter it spun when power was put to the S terminal and to the M terminal, so I assumed it was good and reinstalled it. There were also several loose ground wires and the R wire from the starter to the ballast resistor was shorting to the frame.
So I reinstalled, fixed all the other issues I could find, and it's still not starting or even making a Click noise when the key is turned.
I did verify +12 to the S wire when the key is in the Start position.

So you think it might still be the starter, or is there another relay or possible issue that could be causing this? If it is the starter I'll be picking me up one of them 3/8 swivel sockets cuz taking that top bolt off 3 clicks at a time wasn't a fun time.

eb