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positive or negative ground

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I have two 1972 R795S dumps that were my dads. He always took care of the batteries in these trucks and now with the batteries removed I have no Idea if they are positive or negative ground systems or 12 or 24 volt. Serial number on one is 121471. Anyone got a clue?

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also look at the neg. cable clamp is it too small to go on the pos. post with out stretching it. just the opposite for the pos. if this checks out its neg. ground. look at your volt meter is it 12v or 24v also look at gen or alt tag for voltage spec. the starter solenoid where it bolts to the starter will say 12or24 in the mounting flange. also when you turn the key on if you have a amp.meter it will discharge if polarity is correct

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