House batteries in motorhome will not charge.

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SAK557

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Nov 12, 2012
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House batteries do not charge when plugged into shore power, running the generator or running the engine. How do I determine the cause and fix.
 

John Canfield

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Yes, welcome aboard!

I've never heard of a situation where the engine alternator AND the house charger don't charge the batteries.  What does your dash alternator gauge say the alternator is doing?  Should be around 14V.  How did you determine that the batteries aren't being charged?
 

Gary RV_Wizard

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Or there may be a main battery fuse (or fusible link) that is blown. Or a badly corroded connection to the house batteries, or the battery-chassis ground. Any of those conditions would prevent charging from any source.
 

SAK557

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One house battery was replaced. When plugged into shore power the batteries still do not charge. but if I start the engine the house batteries charge according to the One Place readout. When I shut the engine off the One Place readout displays less then a full charge and the converter/inverter does not start to fully charge the house batteries.
 

Jammer

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It's difficult to troubleshoot electrical problems over the internet because a qualified person who is physically present will notice things going on that may not be obvious to others.

If you've replaced at least one of the batteries, chances are that the inverter/charger, the wiring, or the battery disconnect are to blame for any remaining problems.  Checking voltages at each of these points with the charger operating should identify the problem.  Some inverter/chargers have a variety of different modes and have to be turned on manually in addition to being connected to shore power in order to charge.
 

bbbeebop

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Have you checked the battery disconnect switch?  If it's off then the coach batteries will not charge when plugged into shore power.  You say you changed one house battery, if there is more then on they all should be the same so as not to cause a bad one from killing the good one etc:
Good Luck!
 

John Canfield

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SAK557 said:
One house battery was replaced.

Batteries in parallel, like yours (and mine) should ALWAYS be replaced in complete sets with the exact kind/brand/capacity.  Never, ever only replace one of a parallel battery set.
 

Conquest aka Robert

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Apr 24, 2011
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I would look for a wire that got missed in the switching of the battery.  ;D

Check the water levels also to low and they won't charge.

Then get a voltmeter out and start checking power flow. ;)

Even possibly taking the batteries out and charge them seperately on a charger.

Consider taking them to a store and get them load tested to make sure they are good batteries.


 

Ernie n Tara

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Johh,
How about break the silly discussion off to a seperate thread and see if we can't help the OP with his problem. Too many people are likely to be influenced by the innaccurare information.
Ernie
 

JaKM

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Oct 4, 2012
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Just had a similar problem on my '03 Brave. Batteries wouldn't take a full charge, charging systems (alternator and converter) were putting out good voltages. Replaced the batteries which seemed to work for a while but,after a couple weeks it was back to the same deal. They'd only show about 2/3 charge on my levels panel. I jacked them up a couple times using a 12amp battery charger but that wasn't fixing anything. Then one day I lost all my 12v system. To make an already long story short, I found a loose ground on the back of my 12v fuse panel. Now my batteries show a full charge all the time and my lights have never been brighter. :)
 
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