Full Floater Posted September 19, 2016 Share Posted September 19, 2016 I have 4, 6 volt batteries in my 78 R model, that are on their way out along with the cables. I was thinking of converting to 2, group 31, 12 volt batteries to replace the 6 volts. Has anyone done this? Quote Link to comment https://www.bigmacktrucks.com/topic/46916-4-6-volt-batteries-to-2-12-volt-batteries/ Share on other sites More sharing options...
kscarbel2 Posted September 19, 2016 Share Posted September 19, 2016 Substituting the standard four 680CCA Group 4 6-volt batteries with either two or three 925CCA Group 31 12-volt batteries was a factory option with the former Mack Trucks, for operators desiring lighter weight for maximum payload. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/46916-4-6-volt-batteries-to-2-12-volt-batteries/#findComment-346167 Share on other sites More sharing options...
br549 Posted September 19, 2016 Share Posted September 19, 2016 Done several this way using 3 or 4 12 volt batteries, works great. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/46916-4-6-volt-batteries-to-2-12-volt-batteries/#findComment-346215 Share on other sites More sharing options...
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