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Old 08-09-2009, 03:27 PM   #1
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1987 32' Excella
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Hot Battery?

Hey all,

I plugged in overnight to top off the batteries ( I'm trying to figure out why my jack isn't working) and went to check the voltage this morning. Both batteries read 12.6 volts, one is incredibly hot to the touch the other is not. Any ideas out there? Any help is appreciated.


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Old 08-09-2009, 04:28 PM   #2
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Are the two batteries wired together? Did you disconnect the charge wire to the batteries and then measure each battery separately (without being wired to anything)?

What type of charger are you using?

Hot batteries usually indicates a short, meaning a dead cell in the battery.



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Old 08-09-2009, 04:37 PM   #3
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Replace batteries all the time unless Delco batteries are used. I am not a rep.
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Old 08-09-2009, 05:12 PM   #4
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i'd guess when you test the batteries individually, you'll find one bad battery. they should be replaced in pairs.
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Old 08-09-2009, 05:20 PM   #5
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Sorry, I should have been more specific. I'm charging the batteries through the converter, I'm not exactly sure what kind but it's relatively new. I did not disconnect them before measuring, but I'll do that next. The hot one was actually 12.6 volts and the other 12.66.

Perhaps a short in the battery would be the cause of my jack acting up?


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Old 08-09-2009, 05:59 PM   #6
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Check the jack fuse. It could be blown and have nothing to do with the battery. On our trailer, the jack is wired directly from one of the batteries. Check that too.

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Old 08-09-2009, 06:33 PM   #7
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Thanks for the replies. I'm guessing I'll find the hot one is bad, and I'll replace both, and maybe with Delcos.


This should probably be posted elsewhere but speaking of the jack; the fuse is good, it is pigtailed with the hot for the break-away and the wiring appears to be intact (no obvious rubbing on the frame or propane cover). Could one bad battery cause it to work intermittently?

Thanks again to everyone, this site is indispensable.

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Old 08-09-2009, 08:24 PM   #8
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Yes and no.
The jack is a fairly high amp draw but the batteries at 12.6 should run the jack even if one battery is going bad.

If one of the batteries has a close to a dead short internally then "yes" it could stop the jack from working.
However; a short of this magnitude would draw the good battery down fairly quickly when not plugged in to shore power.

What I would look for 1st is a corroded connection at the battery terminals. Corrosion acts like a resistor and will not allow enough current (amps) get to the jack. They will also cause heat since it is a waste of power when charging or trying to use the jack.


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