cranecrazy2 Posted September 8, 2006 Share Posted September 8, 2006 I purchased a 1980 Mack R-686ST it has (4) 6 volt batteries was wondering if I can change these to (2) 12 volts? Is there a reason that they need to remain as 6 volts?Thanks,Buck Quote Link to comment https://www.bigmacktrucks.com/topic/1505-question-about-batteries/ Share on other sites More sharing options...
CML Service Posted September 9, 2006 Share Posted September 9, 2006 Buck, You should be OK changing to 2 - 12V batteries. Use the best you can buy group#31 950 or 1000 CCA. I run my R model with 2 batteries and have never had a problem. Just be sure the starter and the wiring is in good shape. One battery per box will do it or two in one box wired in parallel not in series like the six volt. Chuck Quote Link to comment https://www.bigmacktrucks.com/topic/1505-question-about-batteries/#findComment-7449 Share on other sites More sharing options...
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