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Electrical Discussion of preventative/corrective maintenance and other technical issues regarding your coach's electrical system.

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  #1  
Old 05-06-2012
Jay Shelley Jay Shelley is offline
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Default Alternator charging house batteries issue

When driving down the road my house batteries will only gain about 5% of charge for a whole day of driving.
They quickly charge to 100% while on shore power or generator power.
I have had them checked by three different technicians and they all say that the alternator is charging and that the batteries are still good.
Why don't they charge to 100%?
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Old 05-06-2012
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Randy Dupree Randy Dupree is online now
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Just because the alternators putting out voltage does not mean its putting out enough amps to charge all the batteries.
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  #3  
Old 05-06-2012
Itchintogo
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Take the alternator off and have it bench tested for performance by a reputable shop that has the correct equipment. Don't ask me how I know this......
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Old 05-06-2012
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If the alternator is charging your start batteries it is probably OK. Check the voltage on the start batteries with the engine on fast idle, then check the house batteries. It should be above 13 volts and perhaps closser to 14 volts if they are not fully charged already. It sounds like you may have something wrong with the way the alternator output is distributed to the two banks. It may be as simple as a dash switch position.
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Old 05-07-2012
Jay Shelley Jay Shelley is offline
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Thank you Randy, Gary and Gardner for your replies. I can see that I have more investigating to do.
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