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Or maybe M56B1 since I see a mount for the spare tire swing away arm on the cowl ahead of the drivers door.

A switch on top would seem to indicate a regular 24V M37 starter. Maybe the alt. is 24 and not 12V. you might see what voltage the alt. produces by taking it to a auto parts store that tests alternators and starters and have them spin it and see what it generates. You could also check the coil...

I would guess the entire elec. system has been converted to 12V, fairly common on trucks used by forestry and community fire departments. Does the truck have a push-to-start pedal or is it a key or push button switch system. Does the starter have a data plate, military 24V starters have "Starter...

Does it have the orig. military distributor? If so, is there a coil mounted outside of it or is the coil still inside. If outside it's most likely a 12V conversion ign. system but if the coil is still in the dist. it's likely to be all 24V. Some 12V conversions did have a military 12V coil in...

:ditto: