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Old 01-15-2013, 01:17 PM   #1
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Battery Charging

I have a 2003 Damon Intruder that the coach Batteries will not stay charged. I read 8.9 volts at the Battery either under shore power or generator. I have checked the Converter and when un hooked from the coah it reads 13.5 volts , but when hooked back to the caoh it read 8.9 also. I looked over the BBC and cant find any bad fuses or where ther might be a reset. Any ideas or suggestion would be appreciated.

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Old 01-15-2013, 01:34 PM   #2
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It sounds like batteries that have a shorted cell or that are so badly sulfated they will not accept a charge. Get your batteries load checked.
-Paul R. Haller-

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Old 01-15-2013, 02:09 PM   #3
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I tend to agree with Paul, but I'd also suggest you grab a known good battery (like from your car) and connect it (and only it) to your converter, then measure the voltage. Open circuit voltage from your convert could be 13.6V, but when under load, if it drops with a battery load because of something wrong in the converter it could give you lower voltage.
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Old 01-15-2013, 05:32 PM   #4
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My problem is the isolating relay. If one battery (house) 13.9 volts and (chassis ) low voltage I would put money on it is the relay. I have tracked this problem in my MH and the dealer is going to fix it because it was something I could not check till using it. This relay allows several things. Aux Start, charging from all three sources 1 shore power, 2 generator 3 chassis engine charging. Now this is a Fleetwood.
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Old 01-15-2013, 05:56 PM   #5
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Battery likely toast, get a stand alone charger and try it.

Shorted cell(s) will have high current on charger and low voltage.

If Battery comes up and takes the charge the converter or wiring is bad, voltage stays low on charger then Battery bad. Converter also may be bad if it was not charging Battery and it self-discharged
Tony & Lori
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battery, charging

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