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Old 06-22-2015, 12:13 AM   #1
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sirpurrcival's Avatar
National RV Owners Club
Join Date: Apr 2010
Posts: 1,058
Drain on the starter battery?

So not very long ago, I changed the starter battery on my 37' gasser. It didn't seem to be able to hold a charge even though it was only about 2-3 years old. I got a replacement battery and now I am finding that it is going dead after sitting for only a couple of weeks. I'm not sure how to check for a power drain on this battery. The coach batteries seems to be holding their charge and they are way older so I am at a bit of loss.

I have double checked for lights or other things that might be energized like the stereo but so far nothing. It was down to 6Volts today which I know is not good for a 12 volt battery. So flat that I could even get the clicks when I went to start it.

Any thoughts, suggestions?

1999 - National Tropi Cal
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Old 06-22-2015, 12:18 AM   #2
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Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 11,950
3 weeks is a normal draw down time because of the memory draw by the engine module, transmission module and radio memory.
Battery disconnect is one way to prevent if you can't plug in and charge.
Solar charger, will help if stored outside and weather permitting.
Even a single light, left on would draw battery down in 3>4 days, so if the draw takes weeks , 99% sure it's just the memory of those modules.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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Old 06-22-2015, 12:39 AM   #3
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Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 4,732
My 2004 W22 Workhorse will run the battery down in two to three weeks.

Monaco puts a battery disconnect switch in the front bay so I just flip it after parking by house where I keep it stored.

So I'd say what you are seeing is normal.
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
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