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The two large terminals are 24v and the starter solenoid positive connection. When the relay engages it puts 24v to the starter solenoid and it cranks. The two smaller terminals are ground and a positive will come from the start relay in the dash panel when you press the start switch. Meter one...

I sand a spot then paint over once bolted to the frame. I always go to the large frame rail. You can also check and make sure the starter has a ground strap to the frame.

Put 24v to the coil contacts on the solenoid. See if it works. Did you upgrade the ground wire to the frame from the battery negative yet? Bad ground cause voltage drop and the frame solenoid won’t work from the cab. The battery box is floating not really grounded. The negative for the whole...

It’s a simple 24v contactor relay. Is yours bad? It’s easy to test it. I have replaced them with smaller relays. No reason for it to be that big.

I would start by adding a big ground from the batt negative to the frame.