dano384 Posted February 25, 2013 Share Posted February 25, 2013 (edited) I recently acquired a 1980 Mack CF Fire-Truck, looks like the batteries are dead. There is are (4) 6-Volt, 7D-VHD 940 CCA Batteries. I notice that on top the battery was connected to the Pos and Neg Poles and on the bottom the "Positive was connected to the Negative" with a short jumper cable, is this normal? Also, it looks like Interstate discontinued the 7D batteries - was wondering if anyone had any sugestions?Picture of batteries is attached. Thanks for the help!-Dan Edited February 26, 2013 by dano384 Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted February 25, 2013 Share Posted February 25, 2013 The jumper from negative to positive is to make them from 6 volt to 12 volt Quote Matt Link to comment Share on other sites More sharing options...
dano384 Posted February 26, 2013 Author Share Posted February 26, 2013 So in theory - can i replace the (4) 6v batteries with (2) 12v batteries? Quote Link to comment Share on other sites More sharing options...
farmer52 Posted February 26, 2013 Share Posted February 26, 2013 If it is a 12V system, yes...3 12V Group 31 connected in series (+ to + and - to -) would do fine. Quote Ken PRR Country and Charter member of the "Mack Pack" Link to comment Share on other sites More sharing options...
yarnall Posted February 26, 2013 Share Posted February 26, 2013 Yes. That is what I usually do. I have (4) 12s in my CF right now. I don't know if it has a 24 volt starter on it though. I usually start my firetrucks on both batteries. My Hahn will start with one good 12 volt battery though. That is if you are really cheap.Mike Quote Link to comment Share on other sites More sharing options...
2stacksuperdog Posted February 26, 2013 Share Posted February 26, 2013 What he said Quote Matt Link to comment Share on other sites More sharing options...
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