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I have rebuilt control boxes for sale in the classifieds
https://www.steelsoldiers.com/showthread.php?187408-M809-M939-Rebuilt-Protective-Control-Boxes&highlight=
You can rebuild the control box with Cole harsee 24063 solenoids. available on Ebay or at oreillys. I have a video on my YouTube page on how to rebuild them
Its more than likely the PCB box. You can remove the fuel shut off solenoid with a 10mm socket. And jump the starter if you need to use it. Truck just won't have any electrical gauges working.
If all your batteries are testing good then smack the PCB with a hammer and see if itll start...
It's a 24v system. 4 batteries makes 24 not 48.
Lights should work all the time if the batteries have any juice at all. You can smack the PCB box under the hood with a hammer with the main switch on and see if itll start.