Posted by big jt on March 11, 2016 at 09:10:31 from (206.72.37.212):
In Reply to: truck batteries posted by flying belgian on March 10, 2016 at 17:57:26:
Take them out, Charge them and have them load tested with a electronic tester, not a simple load tester.
Like others have suggested if one is bad replace them all, keep the better ones (if there are any) for your old tractors, chemical pumps, etc.
I just went through this with my semi (L10 Cummins). One battery was clearly bad (frozen case), the other two had in the 500 CCA range left (group 31 is rated at 950). I replaced all three and will use the two sorta good ones as I described.
OH and BTW someone mentioned two 31 started his L10 just fine, I can back that up by saying that 1 brand new 31 will light the fire in a L10 on a nice day. Just for giggles as I was hooking them up I hit the button with only one hooked up and listened to the motor run as I finished up the work.
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