8D Battery Selection

[SteveRay390]

I purchased a 89 390ec w/3208s last season. There are 2 8d style batteries, one of which acts as a starter/house battery(i believe). The other seems to only start the port motor and is in good working condition. Neither battery has markings that i can find stating the cranking amps etc.. what size is recommended? Since one batteries sole purpose is to start the motors and the other is pulling both duties should the batteries have different capabilities? Thanks alot!

 

[NotHerDecision]

SR390:

I just went through this and did loads of research. Here are a few thoughts. First. The batteries will have to be of the same chemical composition unless you have 2 separate chargers because the profiles would have to be different. After lots of research it comes down to lead acid vs AGM. I decided to stay with lead acid because frankly the out cycle the AGM if they are kept watered. So that being said if yours are easily accessible the lead acid makes the most sense as long as you will check and fill the water once a month.

As far as brands, there are about 100 options and many here will buy the cheapest they can find. I won't do this because in the long-run it's not the most cost effective option and I HATE installing 175lb batteries. I bought rolls surrette and they are awesome, have a 7 year warranty. They are a little difficult to find but really are amazing batteries. Let me know if you have any questions.


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[SteveRay390]

thanks for the info. I didnt realize how much there is too buying new batteries. any idea how to tell what the CCA are on the existing batteries? The stickers dont have any specs but there is a code stamped on the casings but im not sure what it means.

 

[NotHerDecision]

What you have doesn't matter. Look at the requirements for the engine in your manual.


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