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post #11 of 21 Old 09-30-2019
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Re: Odd Battery setup

Quote:
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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post #12 of 21 Old 09-30-2019
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Re: Odd Battery setup

I think the chef's #1 is the better choice. However, when a good battery is paralleled with a not so good battery, the good battery is dragged down. You should determine that the 2 batteries in parallel are similar in performance.
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post #13 of 21 Old 09-30-2019
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Re: Odd Battery setup

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Originally Posted by JimsCAL View Post
Just to be clear, I don't think your wiring sketch is correct. If I look at the second pic that shows all three batteries, I see connections on all three negatives.
Read the OP's fourth line he states it goes through the bulkhead and is not connected to anything. Yes there is a wire but it is not doing anything...i.e. it is floating not set up to a return.
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post #14 of 21 Old 09-30-2019
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Re: Odd Battery setup

looks like two 24's and a 27series as on the battery labels may be the one not connected is dead if it has not been connected it has not been charger for a while. test the batteries before deciding how to reconnect. small batteries for much more then day sailing or one night

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post #15 of 21 Old 09-30-2019
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Re: Odd Battery setup

Quote:
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.
My PO phased some cables, apparently he had a lot of Black lead. I don't condone it but properly marked it's OK if you understand it. Your diagram is good without the positive from the third Battery connected to the second, you loose isolation that's what the main switch is for. Make sure the other end is taped as well, phasing wires is done a lot but only works if maintained on BOTH ends of the cable, but still not the best way..
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post #16 of 21 Old 10-01-2019
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Re: Odd Battery setup

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Originally Posted by albrazzi View Post
My PO phased some cables, apparently he had a lot of Black lead. I don't condone it but properly marked it's OK if you understand it. Your diagram is good without the positive from the third Battery connected to the second, you loose isolation that's what the main switch is for. Make sure the other end is taped as well, phasing wires is done a lot but only works if maintained on BOTH ends of the cable, but still not the best way..

Coloured heatshrink is inexpensive and very good for indicating cable polarity. Now is your opportunity to redo the mess that you have properly with decent battery boxes appropriately aligned, cable runs correctly colour coded and securely fastened neatly to bulkhead etc. If you are really enthusiastic you can even label them.
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post #17 of 21 Old 10-01-2019
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Re: Odd Battery setup

I bet Maine Sail would have a blast with this one.
OMG dude. Dump it all and start over. This is simply disgusting.
Are we allowed to say WTF ?

O.K. rant over. Thanks for getting me going this A..M
Just have a pet peeve about electrical work this shoddy.
My shop may look like hell but the electrical work is top notch.
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post #18 of 21 Old 10-01-2019
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Re: Odd Battery setup

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

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.

...

I'm assuming that it was originally a two battery setup and someone added the third battery and never finished the install.
I agree with your assumption.

The battery with the unconnected negative is not even in the circuit. It's nothing but ballast.

I look forward to seeing how you clean this up and put that 3rd battery to work.
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post #19 of 21 Old 10-02-2019
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Re: Odd Battery setup

Quote:
Originally Posted by davidpm View Post



I'm assuming that it was originally a two battery setup and someone added the third battery and never finished the install.

Most likely a 1/2/B switch, originally with just one battery on each side. A PO decided he needed more capacity so wired an additional battery in parallel.

With that mess, it is simply time to gut all the foundation wiring and start 100% fresh.
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Last edited by Maine Sail; 10-12-2019 at 10:45 AM.
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post #20 of 21 Old 10-11-2019 Thread Starter
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Re: Odd Battery setup

Thank you all.

For now, I'm leaning toward removing the zombie battery.

The boat is for daysailing only and we don't need an enhanced house bank.

But yes I agree it is a mess.

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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