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Old 09-29-2016, 02:05 AM   #1
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Brand: Thor Motor Coach
State: Connecticut
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THOR #4972
Vegas batteries dying on both chassis and coach

2017 Vegas, 25.3. Went to get it ready for a weekend trip today and the chassis battery was completely dead. We had driven it just 2 days before to fill up on propane.

Charged and tested the coach battery. Then ran a test light current draw test (disconnect the negative terminal and put a test light in series) with everything turned off. The light lite up which would indicate a current draw. But I'm not familiar with the electrical components of a motor home. Is there anything in the isolators or converters, etc, that would could be causing this?

Also, a few weeks ago we left one of the ceiling vent fans running for about 48 hours - completely discharged the coach batteries. Is that typical?

I'm just wondering if there is a connection between the two events or ...

Thanks,

Curt
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Old 09-29-2016, 02:30 AM   #2
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Model: 2016 Axis 24.1
State: Florida
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If you use the search function above and search battery drain, you will have an evening of reading on what drains your batteries. Your chassis battery should stay charged for a week or two if it is fully charged when you leave it. Just driving it for a few miles will not charge it. Many prople put a disconnect switch on the chassis battery to stop the drains. I put a solar trickle charger on mine.

As far as the coach batteries are concerned, there is also a drain even with the store switch in the store mode. Running a fan for two days will drain down any battery. Motors are significant draws.

If you store your RV at home, it is a good idea to plug it in every once in a while to charge up the batteries. It is also good to periodically run your generator, but turning the generator on for a short period of time will not do much to recharge the batteries.
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Old 09-29-2016, 04:28 PM   #3
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I had same issue when I had my Vegas home. It sat a week and house battery so dead e start switch not work.

I now leave Vegas connected to house whenever it is parked at home. I leave a/c on 85 which keeps it dry and leave switch in use position. Also leave fridge on.
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Old 09-29-2016, 04:53 PM   #4
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State: Michigan
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THOR #1150
I put battery disconnects on both and leave both off when in storage.
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Old 09-29-2016, 05:54 PM   #5
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Muggs,


We do the same, I just have to remember to monitor the water levels in the batteries a little more closely to be sure no loss of fluids during the times it is hooked up to shore power.


Doc
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Old 09-29-2016, 06:10 PM   #6
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I do. Part of regular routine. Vegas primary use is towing racecar at least twice a month. We also will use for trips. I even in stalled 30 amp outlet in main for it.

Gas milage seems to improve a little wvery trip. Is at 10.4 for trip to WDW campground with generator running 65. JusT passed 3750 miles.
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Old 09-29-2016, 06:37 PM   #7
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Model: 2015 Vegas 24.1
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THOR #2601
Doc -- just sent you an email.

Ed
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