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Old 12-15-2015, 08:36 PM   #8
Yosemitebob
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Brand: Thor Motor Coach
Model: Four Winds 33SW, Diesel
State: Washington
Posts: 352
THOR #3195
Weeks between uses without a charge, your battery is being drained. A new battery of course has a better chance of holding a charge, but the more you let the battery go down the harder it is to charge it up full. A 30 minute charge from your engine is barely enough to charge what it took to start your engine. With the converter running if your battery is 50% down will take 24 hours to charge back up to full. Put a meter on the batter to see how many volts it has. You can get cheap meters at auto parts stores, Walmart, etc. I really think your battery is being pushed to the point of failure. Is it a maintenance free battery or a wet battery, if the latter, you need to keep the water up to level with distilled water.

Even with all the switches in their off position for both coach and chassis there is still a drain on the battery. Leaving it weeks at a time without a charge you are probably reducing the voltage in the battery by a considerable amount. A chassis battery can only handle that so many times before it will not take a full charge again. While your coach batteries are made to handle that load better, they too will be reduced it just takes more time for them.

Also, please note that your keeping the coach plugged in all the time is great for the house batteries, it does nothing for the chassis battery. Perhaps getting a charge on that battery will help.
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