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Beaver_Thunder's avatar
Beaver_Thunder
Explorer
Feb 18, 2020

C12 starting batteries

Was wondering if anyone on here has a C12 and what do they have for chassis batteries to start that motor. I have two Interstate batteries (model 31-MHD with 950 CCA and 1190 CA), with the batteries fully charged, I’m unable to start the engine cold without using the emergency switch. Best I can tell the starter is direct drive and the batteries are good (I have taken the batteries to the Interstate store and they have checked the batteries and say they are in perfect working order). I’m wondering if I have undersized batteries, curious what other C12 owners have set up for battery capacity.
Class A
  • Beaver_Thunder's avatar
    Beaver_Thunder
    Explorer
    Feb 26, 2020
    gsander1 wrote:
    My C12 has two Heavy duty 8D starting batteries.


    George,

    What is the CCA for the 8D's?
  • gsander1's avatar
    gsander1
    Explorer
    Feb 27, 2020
    Beaver Thunder wrote:
    gsander1 wrote:
    My C12 has two Heavy duty 8D starting batteries.


    George,

    What is the CCA for the 8D's?


    Cranking Amps = 1,720
    Cold Cranking Amps = 1,400
  • RFCN2's avatar
    RFCN2
    Explorer
    Mar 02, 2020
    My C-12 has two 8D starter batteries. I have no idea what the CCA is. I just replaced the original ones with similar when they went out ten 1/2 years ago and then again 2 years ago. When I bought the coach it was 7 years old and the batteries were original. BTW on the second pair they worked fine until they did not. No warning for failure. Likely yours need replacement.

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