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Old 04-08-2014, 08:09 PM   #1
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House Battery Problem

I own a 2004 National Dolphin RV with 4 12v house batteries in the hold and 1 12v Chassis Battery under the step. Over the winter the 4 house batteries froze so it was necessary they be replaced. Prior to removing the old batteries I made a diagram of the hookup and I took pictures so I would know how to reconnect the new batteries. Installed new batteries and everything is connected exactly per the diagram and confirmed with the pictures I took.

The Problem: when I connect the ground cable it starts frying the 1 chassis battery. HELP!
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Old 04-08-2014, 09:42 PM   #2
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Can you post the before & after pics here?
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Old 04-08-2014, 10:54 PM   #3
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[
[

Are you sure you have four 12 volt batteries? My 03 has four 6 volt batteries in series producing 12 volts for the four. Of course it could be different but worth asking.

Here is the configuration for four six volt batteries in series producing 12 volts. If 12 volt batteries are linked like this then they produce 24 volts.


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MY one chassis battery under the step is 12 volts. Your four batteries should be linked parallel, (different than the above drawing) right?

ATTACH]60226[/ATTACH]

12 volts parallel
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Old 04-09-2014, 12:31 AM   #4
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Sounds like original batteries were 6 volt not 12 and if you wired same way you are applying 24 volts to the systems! Not a good thing!
See previous post and the drawings for how the should be wired for each type.
Also for reference a battery with 3 fillcaps is 6 volt and a battery with 6 caps is a 12 volt.
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Old 04-09-2014, 06:39 AM   #5
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Well that explains my problem. The old batteries I removed were 6 volt the new batteries I purchased are 12 volt. Since this is the case I assume I need to rewire the 12 volt batteries in Parallel.
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Old 04-09-2014, 06:51 AM   #6
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Well that explains my problem. The old batteries I removed were 6 volt the new batteries I purchased are 12 volt. Since this is the case I assume I need to rewire the 12 volt batteries in Parallel.

I would be inclined to see if I could trade back the 12 volts for the proper 6 volts. Minimally I would make absolutely sure my inverter/converter will handle the kind of batteries you are substituting.

Admittedly I am conservative about making such changes but this may work for you hopefully if that is your choice. Personally I would be inclined to leave the system as designed and take a hit on the batteries if necessary (it may not be) as a dear teacher.
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Old 04-09-2014, 06:56 AM   #7
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The 12volt Side of Life (Part 1)
The 12volt Side of Life Part 2

Here is some helpful stuff for the future. Good luck and let us know how this turns out for you.
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Old 04-09-2014, 08:14 AM   #8
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Thank You for your help. I am trying to switch batteries with Walmart...
Don
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Old 04-09-2014, 08:47 AM   #9
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Good luck with the swap, also be aware you may have blown a fuse when you installed the new batteries, if no 12 volt seems to be working when you hook up the 6 volts look for a large fuse in the line between the batteries and inverter.
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Old 04-09-2014, 10:35 AM   #10
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Don, when you get six volt batteries you want something comparable to the Trojan T 105's. It is just a good standard to judge other batteries by. You want deep cycle "golf Cart" batteries, wet cell. You can get a less expensive battery and if you maintain them well you will get plenty of usage. Much depends on the kind of use you intend to put these batteries to. If you intend to stay in places with full electrical 50 amp hookups then a lesser battery will do just fine. If you intend to boondock and dry camp and use the inverter a lot then maybe upgrading is warranted. At any rate batteries respond well to care and nurture and return the compliment. If they are abused they retaliate and die. I know I have killed plenty of them before getting the message.

I invested in a pro fill watering system to make it simple to refill them and a BatteryMINDer to keep the batteries under charge when not in the MH. I take them out now when I store for long periods. At the same time I purchased my latest set of batteries from Sam's Club and saved some money. I am confident that my new found diligence when it comes to batteries will allow these batteries to live to a ripe old age and die a natural death.
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Old 04-10-2014, 08:09 AM   #11
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You said you took pictures.. POST same please.
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Old 04-11-2014, 06:18 AM   #12
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The Battery issue has been resolved. The old batteries were 6 volt, they we not marked and I was unaware. The new 12v should have been wired in parallel. Thanks for all the help.
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Old 04-11-2014, 07:51 AM   #13
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Quote:
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they we not marked and I was unaware. The new 12v should have been wired in parallel. Thanks for all the help.
I do not believe I've ever seen any wet cell battery marked.

I hope you take my suggestion as advice and not criticism.

You have made a couple of expensive mistakes- one of which could have been a safety disaster. Read, read, read before jumping. Do not assume. Use a voltmeter when doing any electrical work.
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