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Old 09-21-2012, 08:20 AM   #1
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rialta battery charging

just bought 03 rialta H...prior owner installed new coach batteries...why won't engine alternator charge them?

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Old 09-21-2012, 08:53 AM   #2
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Shore power and generator should charge coach batteries.

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Old 09-21-2012, 08:58 AM   #3
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I don't know anything about your coach. Generally speaking though, you will have a battery isolator or most likely a continuous duty solenoid controlling this. It could be bad, or you could have a loose or broken wire or a bad ground.
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Old 09-21-2012, 09:01 AM   #4
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Originally Posted by shep44
just bought 03 rialta H...prior owner installed new coach batteries...why won't engine alternator charge them?
The engine alternater does charge the batteries on the rialta, if it's not then you probably have a different problem. Perhaps the converter is not functioning properly. Of course shore power and the gen. also charge the house batteries.
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Old 09-21-2012, 09:41 AM   #5
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If the previous owner installed new batteries and then sold it, I'd guess he thought the problem was too expensive to handle.
I'd test the battery isolator with a 12VDC meter. If it's good, then I'd check to see 12VDC is getting to the batteries. If it's not, then I"d find the fuze or circuit breaker between the batteries and the isolator. I'd guess that fuse is the problem, as it is sometimes hard to find or see, and might be where the previous guy gave up.
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Old 09-21-2012, 12:14 PM   #6
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Hi Shep, welcome to the forum. If your rig is set up for the alternator to charge the house batteries and it is not, then you probably have a bad charge selenoid.
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Old 09-21-2012, 01:54 PM   #7
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There are two common configurations for Motor Homes

1: Standard isolator: In this system the engine's alternator charges both the chassis and the house (Aux) batteries when the engine is running.. Now depending on the isolator "logic" if the chassis battery is defective it may never engage the solenoid, but you would have starting issues if that were the case... Likewise a defective alternator or a loose drive belt on the alternator can cause issues.

In this system shore or generator power ONLY charges the house, not the chassis.

2: BIRD (BI-directionsl Relay Device) this one lets the tngine charge both sets of batteries, Same as 1.. but it also lets the house converter (Shore/Generator) charge the chassis (main) battery

If the alternator is charging the chassis battety, but not the house, your isolator is defective. OR there is a bad conneciton somewhere along it's wires.

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battery, charging

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