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Old 08-10-2009, 04:00 AM   #1
1 Rivet Member
1994 34' Legacy 34
Bath , Michigan
Join Date: Aug 2009
Posts: 10
Coach batteries not charging

I recently took ownership oif a '94 34 foot Land Yacht that has about 23,000 miles on it. For some reason the coach batteries will not charge while plugged into 110 volts, although they will charge from the alternator when the engine is running, from the genset, or from an external battery charger.

The coach batteries are two year old Everstart Maxx deep cycle from Wally World, and because they will charge from all sources except 110 volts using the vehicle power cord, I doubt if they are contributing to the problem.

The converter is the OEM Power Source brand, model PC-50, and when the MH is plugged in to a 110 volt source the converter supplies 13.3 volts to the batteries. From what I have read, the majority of converters usually supply the same amount of voltage to the batteries.

I have removed and cleaned and checked every single connection on the batteries, converter, isolator, etc. with no success. The OEM owners manual is very detailed with extensive wiring diagrams, but I cannot find any indication of a switch or relay that would prevent the converter from charging the batteries.

And I do not let the batteries become deeply discharged, when they have about one-third charge left, I start the engine and recharge them.

So, does anyone think the OEM converter is the problem? I do not want to buy a new $200 converter that cannot be returned if it turns out the converter isn't the problem. My research indicates that most 12 volt batteries need at least 14 volts to effectively recharge.

And does anyone have a recommendation for a quality brand of converter that should be used for replacement of the OEM unit?

Thanks for any advice and suggestions.
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