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Old 08-24-2019, 08:45 PM   #1
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98 Eagle Chassis Battery Over Charge

I keep my 98 Eagle plugged in at home (50 amp) all the time. Last weekend I noticed a rotten smell coming from the back of the coach. I also could hear the battery charger clicking on and off every minute or so. I opened up the battery compartment to discover the chassis batteries very hot to the touch. The coach 6V batteries were okay.
I shut off the shore power to cool the batteries, but now are toast. I am going to purchase two new 12v batteries but, do not know what caused the problem. Is this a failure of the charging system of the Heart Interface system? If so can I disconnect the chassis side/
Any help would be appreciated.
Mike and Family
98 American Eagle EVS, Cummins C8.3
2013 Jeep Wrangler Sahara, Blue Ox
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Old 08-24-2019, 09:06 PM   #2
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Without knowing what the voltage was going to the chassis batteries , It's purely a guess : BUT ; any overcharge should have damaged the coach batteries too.

How old were the chassis batteries ?
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
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Old 08-25-2019, 12:00 AM   #3
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I'm leaning on you had a bad chassis battery....once you replace them check charging voltage at them with a meter on shore power plugged in with heart source manager charging them, and also with shore power unplugged, check voltage at batteries with engine running.

I'd also take a hard look at cables, ground connections as well.

... fwiw, the heart source manager charge's the coach batteries, then there's a BCC relay in the chassis fuse box, just to left side of batteries, that has cable run up to chassis batteries.

If the source manager charger was bad, no batteries would be charging.
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Old 08-25-2019, 08:11 AM   #4
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The batteries are 4 years+ old. They were in the coach when we purchased it. I am in the process of buying new 6V batteries for the coach side. They are starting to loose voltage. I am buying new chassis batteries today.
Thanks for the advise. Probably was bad chassis battery. I will let you know later today what happened.
Mike and Family
98 American Eagle EVS, Cummins C8.3
2013 Jeep Wrangler Sahara, Blue Ox
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Old 08-25-2019, 11:21 AM   #5
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I agree with Mac - odds are strong that you had a bad chassis battery that fooled the charger into pouring in the amps to try to bring it up to 100% charge. There is very little that can go wrong with the Heart that could make it produce an incorrect voltage.

One bad or shorted cell in one battery (house or chassis) can fool the charger into thinking the battery bank is mostly discharged and thus should receive the "bulk" or "absorption" stage of charging, where amps are high. The bad battery overheats and, to some extent, so do the remaining good ones.

A load test on the batteries should show up which one is bad, but at 4+ years I would just replace them. It's not a good idea to replace just one of a set unless they are all nearly new.
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Old 08-25-2019, 03:12 PM   #6
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Replaced the chassis batteries, voltage 12.7V as new. Charger came on boosting to 14.1V to bring charge up. Load tested both chassis batteries and one is showing 11 V, but cannot take a load is toast. The other is week, but shows a voltage od 12.7. The first battery was the culprit.
Checked coach batteries and are still in good shape. A little loss of water but I had topped them up just a month ago. Still going to change out coach batteries next; as they are original to coach purchase.
Travelling out tomorrow to Windsor/ Detroit area for a family visit. This will be a good test as we will be mostly boon docking.
Mike and Family
98 American Eagle EVS, Cummins C8.3
2013 Jeep Wrangler Sahara, Blue Ox
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chassis, battery

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