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Interesting. You can jump the 24v positive from the fuel solenoid and go to the regulator 24v contact to make the alt work.

Look around the drivers side of the trans thats where the pto goes its electric solenoid engaged. Maybe a wire is pinched and shorted somewhere. You could probably just leave it out.

The one with green pcb power panel is an A1 so second gen.

Troubleshoot. The first gen trucks dont have an engine computer.

Some of the earlier style starters have a thermal protection that is known to go bad creating a no start condition. But its very easy to go step by step and diagnose.

Starter, aux starter solenoid, start relay in panel or bad start button. I would start with the relay in the panel you can jump the contacts with the relay out and see what happens. Top to bottom should crank it.

There is a neutral safety but the transmission default is to go into neutral. If any wires are not connected or damaged that would prevent start. Do you have correct voltage to the trans ecu and the engine ecu? Low voltage causes a wide array of issues in these trucks. If you have power to both...

When you turn the power switch on does it engage the fuel solenoid on the engine?

The 3126 should still have the circuit board. I think he got the truck in pieces and put it all back together.

24 volt goes directly to the starter from the battery bank with its own separate power wire. 12 and 24 go into the cab thru the polarity box and up to the power panel. If the power panel inadvertently got bent or flexed in some way the copper traces could break resulting in an open circuit...

The first gen trucks have an all mechanical motor and are pretty easy to start. You can call me I am pretty good with them 203-378-7105 I will be around for a few hours Will