ISC Batteries

[TechWriter]

I'd like to replace my two, 6V engine batteries with sealed lead acids - recommendations?

[Downsizer]

We replaced all ours last January with all AGM from Interstate... love um!! We boon dock a lot and with 4 solar panels, we can keep them full and no odor or toxic spillage! We got the 4 - 6 volt at 220 for the coach and a 1400 for the chassis

[Gary RVRoamer]

You have a pair of 6V's to start the engine? That's odd. Normally there would be a pair of 12v for that, with something like 900-1000 CCA rating on each. You need a lot of cranking power on a big diesel and 6V batteries aren't up to it.

You may want to recheck what you have.

[GaryKD]

Hi Tech Writer,
Whatever you have, get the largest capacity batteries that will fit in the space you have.

[TechWriter]

Quote:

Originally Posted by Gary RVRoamer You have a pair of 6V's to start the engine? That's odd. Normally there would be a pair of 12v for that, with something like 900-1000 CCA rating on each. You need a lot of cranking power on a big diesel and 6V batteries aren't up to it. You may want to recheck what you have.

Yep, you're right -- they're two, 12V CarQuest 31HDS30s.

I looked at the wrong wiring chart. Duh.

[KIX]

Optima is a truly maintenance free battery. I use two of their 1000CCA batteries for the chassis. Most folks are familiar with 3 of their line-up....the yellow top, the red top and the (light) blue top. They also make a lesser known (darker) blue top starting battery commonly used for marine diesels. It has a dark gray case and royal blue top........that's what we use for the chassis.

[Gary RVRoamer]

O'Reilly Auto parts has decent price on a Group 31 with around 1000 CCA. And most Freightliner dealers sell Alliance batteries (FL in-house brand name) in that size and at reasonable prices.