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Old 05-05-2013, 02:38 PM   #1
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Do I need two 1100 CCA start batteries?

My ancient rig has always had two 1100 CCA or larger 8D starting batteries.

The electric wiring schematic shows the two batteries and a separate positive wire running from each only to be combined later before it gets to the starter system.

It has a C8.3L mechanical engine and an Allison 3060.

Obviously, when one battery goes, the other needs to be replaced and one weighs less than two at 113 lbs each.

Does this type of engine require two batteries or is that overkill?
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Old 05-05-2013, 02:45 PM   #2
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I have the same engine and have two group 31 - 12 volt batteries that work quite well...they are 950 cold crank amps...never have had problems starting engine.
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Old 05-05-2013, 03:23 PM   #3
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I think the OEM batteries are over kill.
I have a ISB that came OEM with 2 Freightliner Group 31 950 cca
Replaced them May "06" with 2 Odyssey Group 24 950 cca
They are 7 years old now and still work great.

But the OEM was replaced at 7 years 9 months and still working.
Just thought it was time to replace.
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Old 05-05-2013, 05:46 PM   #4
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Group 31 950CCA from Sam's, about $97 each.
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Old 05-05-2013, 06:19 PM   #5
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Dodge P/Us with 5.9 Cummins, started out ( first 5 years ) with a single battery 1150 CCA, with the 94 body style change, they went to 2 batteries of 900 ? CCA for improved cold weather starting and also incorperated a larger intake heater, that required more power.
Both cold and hot temps are hard on batteries and starters.
All brands of diesel P/Us now use 2 batteries.
JMHO . stick with the 2 , I think a single battery wouldn't last 1/2 as long as the 2 so no $$ saving. As others have said maybe a slightly lower CCA would serve you well , but I wouldn't go below 900CCA.
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Old 05-05-2013, 07:19 PM   #6
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With two 12 volt batteries assume they are wired so you get twice the cold cranking amps of the one battery but just 12 volts. Is that what we are doing? I believe that is called wired in parallel vice serial. What is the CCA called for on the 8.3L Cummins? Thanks
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Old 05-05-2013, 09:03 PM   #7
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Quote:
Originally Posted by fighterpilot View Post
With two 12 volt batteries assume they are wired so you get twice the cold cranking amps of the one battery but just 12 volts. Is that what we are doing? I believe that is called wired in parallel vice serial. What is the CCA called for on the 8.3L Cummins? Thanks
Wiring diagrams show , 2, 950s for both Cat and Cummins in 99 f/l chassis. 12 volt system , parallel wired.
I would assume that the amps are a result of engine makers spec's.
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Old 05-06-2013, 09:27 AM   #8
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Quote:
Originally Posted by deandec View Post
My ancient rig has always had two 1100 CCA or larger 8D starting batteries.

The electric wiring schematic shows the two batteries and a separate positive wire running from each only to be combined later before it gets to the starter system.

It has a C8.3L mechanical engine and an Allison 3060.

Obviously, when one battery goes, the other needs to be replaced and one weighs less than two at 113 lbs each.

Does this type of engine require two batteries or is that overkill?
It probably only needs two batteries if you want it to start!
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Old 05-08-2013, 02:07 AM   #9
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I know American Coach/Spartan specified 2 950 CCA's for my C8.3 on the Eagle.

Starts right up with my 2007 batteries.

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Old 05-08-2013, 01:22 PM   #10
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It appears most with my engine are using two starting batteries of Grp 31 size.

Additional research indicates that both Grp 31 and 8D are heavy duty commercial application batteries but the 8D are larger and have more CCA potential in that size.

I also discovered an opinion that if running an Over-The-Road AC system the 8D is likely needed. Our rig has that "bus air" system so I guess 8D is the way to go.

Thanks to all for the info.
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Old 05-08-2013, 01:42 PM   #11
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Our ISC came with two 950 CCA batteries. Couldn't find them quick when I thought I needed them so I ended up with two 1000 CCA batteries. BTW, they actually weren't bad, turns out it was the starter. Probably could have gotten 10 years out of them like my house batteries rather than just 9.
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Old 05-08-2013, 10:00 PM   #12
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Dean, I have an 8.3 mech injected with 1 8d, mine always starts just fine, but mine never has a very long crank time...I also dont use the coach in the winter
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Old 05-08-2013, 11:06 PM   #13
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2 8D 1100 cca is way over kill. The 8D is a huge battery. 2 950 cca gp 31s will do the job. The battery box for a gp8d is big enough for 3 gp31 if needed.
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Old 05-11-2013, 03:29 PM   #14
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A typical 8D battery would have a 1400+ CCA rating. Are you sure yours are only 1100?

In any case, I think a pair of Group 31 starting batteries at 950-1000 CCA each ought to start your engine just fine any time in above-freezing weather.
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