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Old 11-12-2005, 12:48 PM   #1
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hot battery

85 345. first inline house battery(of two) gets hot(second battery does not) when unit plugged into land power. batteries are wired positive to positive etc. what is the cause-do i need to turn the switch off in the battery compartment each time i plug in? i read the thread on boiling batteries in 2004 but no info contained on this issue.

thank you
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Old 11-12-2005, 01:45 PM   #2
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1993 21' Sovereign
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Quote:
Originally Posted by mlmarch
85 345. first inline house battery(of two) gets hot(second battery does not) when unit plugged into land power. batteries are wired positive to positive etc. what is the cause-do i need to turn the switch off in the battery compartment each time i plug in? i read the thread on boiling batteries in 2004 but no info contained on this issue.

thank you
Hmm. Try disconnecting both batteries from each other, and from the charge lead. Check the voltage. If they are both at least 12.65 volts, they are fully charged. But my guess is you will find the battery that is getting hot will be seriously under voltage. This can be from a number of things, but the two most common are: The battery has a bad cell, and either the cell is draining the battery while unplugged, or it is shorted internally, causing a lot of heat.
The other possible cause is the battery that is not getting hot has a bad connection, either externally (cable end) or internally (open in a cell). It is just sitting there, allowing the other battery to power everything in the coach, and, of course, bear the brunt of all the charger's recharging efforts.
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Old 11-12-2005, 05:33 PM   #3
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1989 34' Excella
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If the hot battery is in warrentee, take it back and get a new one. If not full warrentee, take it back and have it tested. They may give you an allowance. You need a really good voltmeter like a DVM to check the quality of the battery.
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Old 11-18-2005, 08:33 PM   #4
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1972 25' Tradewind
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if the non-hot battery is bad then the converter will over charge the good battery making it hot. the converter is trying to fully charge the bad one but over charging the good one which will make both batteries bad if let go long enough. and your coach is mostly running on the converter



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