wvmack Posted May 15, 2014 Share Posted May 15, 2014 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? Quote Link to comment https://www.bigmacktrucks.com/topic/35711-positive-or-negative-ground/ Share on other sites More sharing options...
39 Baby Mack Posted May 15, 2014 Share Posted May 15, 2014 If it's a '72 should be positive ground, I would think it is 12volt.If the battery cables go right from the battery box to the starter it's definitely 12volt.What kind of batteries came out of it, group 4 six volt?Ron Quote Link to comment https://www.bigmacktrucks.com/topic/35711-positive-or-negative-ground/#findComment-245508 Share on other sites More sharing options...
Superdog Posted May 15, 2014 Share Posted May 15, 2014 if nothing has been changed,they would be positive ground 12 volt Quote Link to comment https://www.bigmacktrucks.com/topic/35711-positive-or-negative-ground/#findComment-245509 Share on other sites More sharing options...
Maddog13407 Posted May 15, 2014 Share Posted May 15, 2014 yup, should be 12 volt positive ground.usualy the terminals are idiot proof.... he one is a hair bigger than the other Quote Link to comment https://www.bigmacktrucks.com/topic/35711-positive-or-negative-ground/#findComment-245510 Share on other sites More sharing options...
Bigdogtrucker Posted May 15, 2014 Share Posted May 15, 2014 Any pic's of the trucks?! Quote Link to comment https://www.bigmacktrucks.com/topic/35711-positive-or-negative-ground/#findComment-245512 Share on other sites More sharing options...
gearhead204 Posted May 15, 2014 Share Posted May 15, 2014 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 Quote Link to comment https://www.bigmacktrucks.com/topic/35711-positive-or-negative-ground/#findComment-245513 Share on other sites More sharing options...
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