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Old 10-13-2021, 11:10 PM   #1
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Brand: Thor Motor Coach
State: California
Posts: 8
THOR #20219
Power from house batteries

Friends-we installed two new 12 volt batteries this spring. On our cross country trip the batteries stopped functioning and we ran off shore power at RV overnight sites. I have been told the batteries powered down to under 10 volts. Why did this happen? I thought the batteries charged while the engine was running and the power light near the steps was engaged? Any help appreciated. This is a Class C RV. (Chateau) Thank you

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Old 10-14-2021, 12:20 AM   #2
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Brand: Thor Motor Coach
Model: Miramar
State: California
Posts: 260
THOR #22927
The batteries should charge while driving. Do you have a storage and use switch, if so be sure it’s in use while driving, and charging your system. There should also be a fuse , I think 15 amp near the batteries have you checked it yet?
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Old 10-14-2021, 12:20 AM   #3
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Brand: Thor Motor Coach
Model: 2020 Vegas 25.6
State: Montana
Posts: 1,944
THOR #20220
Check your BIM
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Old 10-14-2021, 12:21 AM   #4
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THOR #22927
Please also be sure after you replaced the batteries, the cables were placed back correctly.
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Old 10-14-2021, 12:22 AM   #5
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Brand: Thor Motor Coach
Model: Miramar
State: California
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THOR #22927
Check battery ground and cables are all tight.
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Old 10-14-2021, 12:51 AM   #6
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Brand: Thor Motor Coach
Model: Chateau 24F
State: Ohio
Posts: 831
THOR #16721
We have a 2020 Chateau 24F, which uses a 2019 Ford chassis. If I remember correctly, there was a recall on our BIM, which was replaced by the dealer shortly after we got the MH in fall of 2019. Might want to inquire about that possibility.

I don't remember having any charging issues then... but we hadn't had the MH long enough to really find discover a problem.
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Old 10-14-2021, 03:18 AM   #7
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Brand: Thor Motor Coach
State: California
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THOR #20219
Batteries

Thanks to all. I will explore those possibilities.
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