According to my panel, my coach batteries show 100% charge after running the engine. However, after less than 4 hours they are almost completely drained. I have checked to make sure no lights or anything is on that may be causing the batteries to drain so quickly. And I had the batteries tested at a local Autozone and they said they were fine. Any ideas what may be causing the battery drain ?

A way to determine the amp draw is to hook up a meter between ground and the negative battery terminal. Then you just pull fuses, or throw circuit breakers, until you find what is drawing the current.Did they disconnect each battery when they were tested at Autozone? If they left them connected together, they did not get an accurate reading.

How old is your battery? Sounds like it is toast to me.

The OEM battery status devices that come with many RVs are worthless - relying on them to determine battery status maybe a mistake. Consider letting your battery rest for at least 4 hours and measure the voltage at the battery (multimeter works) - there should be plenty of tables on line which will tell you the status of your battery based on the voltage you read.

Storage bay lights left on by mistake?

My 2 cents is on a bad battery which will eventually take it's toll on the others. Having them tested by a kid at AutoZone is not always accurate. As stated above, if they didn't disconnect each battery, which I highly doubt, the test was invalid. All RVrs should have a meter and know how to use it. They are free at any Harbor Freight. Google free meters Harbor Freight for the coupon. Get one, research how to use it and use it often. Otherwise you're simply running in the dark....Dennis

coach battery draining | Good Sam Community

ksg5000
Explorer
Aug 24, 2018
The OEM battery status devices that come with many RVs are worthless - relying on them to determine battery status maybe a mistake. Consider letting your battery rest for at least 4 hours and measure the voltage at the battery (multimeter works) - there should be plenty of tables on line which will tell you the status of your battery based on the voltage you read.
IB853347201
Nomad
Aug 24, 2018
How old is your battery? Sounds like it is toast to me.
rgatijnet1
Explorer III
Aug 24, 2018
A way to determine the amp draw is to hook up a meter between ground and the negative battery terminal. Then you just pull fuses, or throw circuit breakers, until you find what is drawing the current.
Did they disconnect each battery when they were tested at Autozone? If they left them connected together, they did not get an accurate reading.

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