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Re: [GMCnet] replacement battery questions [message #323519 is a reply to message #323517] Thu, 07 September 2017 13:32 Go to previous messageGo to previous message
Emery Stora is currently offline  Emery Stora   United States
Messages: 959
Registered: January 2011
Karma:
Senior Member
I you put a charger on one do just like you have detailed. Put the + cable to the + on one battery and the - cable to the - post on the other battery.

In a 12 volt battery you have 6 cells connected from the + of one to the - of the next one and so on. With two 6 volt batteries you have 3 cells in each. One cell in the first battery is connected from the + to the - of the next cell.
3 cells are connected internally this way then there is an external connection from the + post of one battery to the - post of the other battery, then the three cells in the second battery are connected in series the same way.
When done, the two six volt batteries has six cells connected exactly as the six cells would be in a single 12 volt battery.

When you were charging the neighbors marine battery the sizzling sound was the liquid boiling in the battery. The battery was likely very hot as you had been charging it for 48 hours. Disconnect the cables and let it cool and then reconnected it again.

Any Cummings dealer that I have dealt with has been extremely expensive and not that good on their service.
I would suggest that you find another GMCer who is familiar with servicing the Onan and get them to help you.
I have worked on many GMCers Onans and have solved a lot of problems. I recently replaced a capacitor and diode in an Onan control panel and it now works fine.
Your signature line doesn’t give your location. With that I might be able to recommend a GMCer in your area that could look at it.
Or, if you are going to go the the GMCMI convention in Elkhart I could look at it there.


Emery Stora
77 Kingsley
Frederick, CO

> On Sep 7, 2017, at 12:08 PM, Deb McWade wrote:
>
> Had the neighbors old 12V marine battery on the charger for over 48 hrs. This morning I checked in and it has reached the 75% mark (haven't checked
> the voltage yet) on the charger (btw, charger runs at 1.1 amps) - but I heard a faint sizzling/crackling sound. Not knowing what it might be, I have
> disconnected it! Sounded like someone was frying bacon in there somewhere.
>
> In the meantime, have picked up (figuratively) 2 6V 230 AmpHr / 448 minute reserve golf cart batts - didn't realize they were that big! - and will be
> installing everything when I get back tonight. Didn't pick up a bridging cable yet because I wasn't sure if my PO had 1 or 4 gauge cables back there.
> Knowing him, it was possible he used 1 gauge and there was no point getting a 4 gauge bridge.
> Also need to sort out a tray of some sort.
>
> Question - if I have to put a series system like that on a charger - do I approach it like one big 12V battery and go from the + on one to the - on
> the other and set the charger for a norm 12V? Or disconnect the bridge and charge them individually as 6V?
>
>
> Got the adapters for the starter cables and that is going in as well. At least if the fires come my way, I will be able to start up and pull out.
>
> Next step - bringing her in to Cummins next Friday to have them do a troubleshoot on the Onan and maybe get that happening, so by spring, I might have
> a snowball's chance at going somewhere :)
> --
> Deb McWade
> "Li'l Sister"
> '77 Kingsley, 403, EBL EFI;
> TZE167V101404
> It's Bigger on the Inside!
>
>
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