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 https://www.bigmacktrucks.com/topic/30176-1980-mack-cf-fire-truck-battery-question/ 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 https://www.bigmacktrucks.com/topic/30176-1980-mack-cf-fire-truck-battery-question/#findComment-167819 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 https://www.bigmacktrucks.com/topic/30176-1980-mack-cf-fire-truck-battery-question/#findComment-167836 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 https://www.bigmacktrucks.com/topic/30176-1980-mack-cf-fire-truck-battery-question/#findComment-167838 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 https://www.bigmacktrucks.com/topic/30176-1980-mack-cf-fire-truck-battery-question/#findComment-167840 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 https://www.bigmacktrucks.com/topic/30176-1980-mack-cf-fire-truck-battery-question/#findComment-167841 Share on other sites More sharing options...
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