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post #11 of Old 09-30-2019
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Re: Odd Battery setup

Originally Posted by davidpm View Post
Hunter 34 with an odd battery setup.

As you can see someone messed up the battery wiring, didn't even use the right colors.

Any guesses as to what the PO was thinking.

As you can see from my crude drawing a negative wire from the battery is going through the bulkhead and one battery's negative terminal is not even attached to anything.

Any guess as to what the idea was.

I'm guessing that the two red positives go the switch. the negative goes back to a negative bus bar or alternator. On the other side of the switch where I can't see is a red wire to the positive switch panel I suspect.

I'm assuming that it was originally a two battery setup and someone added the third battery and never finished the install.
It appears you have 3 similar Group 24 12 volt batteries. They have CCA specs on them so they may be dual purpose. Their Ah are 79.

I would rewire. Two choices

1 - one used as a started on a separate bank 1 , and the other two in parallel to form a house bank of 158 ah ( 79. Usable....not much) especially if you have refrigeration of any kind.

2-all three in parallel meaning one bank 237 ah.....118 usable ah. Can also be used to start .

I like 1 big bank vs two because of the switch over to absorption of the larger bank ( usually at 85%. Charge ) allowing you to charge 1 big bank to more total ah more quickly.

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