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03-13-2021, 01:49 PM
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#1
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Junior Member
Brand: Thor Motor Coach
Model: Challenger 37 FH
State: Texas
Posts: 18
THOR #19736
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Chassis battery dead
I thought when plugged into shore power all batteries get changed. Chassis battery reads 2.1v on my Thor Challenger 37FH. House batteries are at 13.6. Any thoughts
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03-13-2021, 02:27 PM
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#2
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 696
THOR #13399
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Make sure your salesman switch is on.
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03-13-2021, 02:27 PM
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#3
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Quote:
Originally Posted by jmoffroad66
I thought when plugged into shore power all batteries get changed. Chassis battery reads 2.1v on my Thor Challenger 37FH. House batteries are at 13.6. Any thoughts
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Your BIM or BIRD/Trombetta is not working correctly.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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03-13-2021, 02:34 PM
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#4
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Senior Member
Brand: Thor Motor Coach
State: Missouri
Posts: 2,328
THOR #6903
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Time to break out the VOM and get busy
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03-13-2021, 02:41 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 696
THOR #13399
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Check the thread ,CHASSIS COACH BATTERY VOLTAGE , its a very good explanation and test procedure. The BIM is what isolates your coach battery from your chassis battery. When plugged into shore power you should hear a click up fr every 30 to 45 minutes and see both battery voltages the same then hear click again and chassis battery drop to around 12.6 or 12.8 also try using your emergency start button on dash,if engine starts check chassis battery voltage should go up to about 14.4
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03-13-2021, 04:15 PM
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#6
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Junior Member
Brand: Thor Motor Coach
Model: Challenger 37 FH
State: Texas
Posts: 18
THOR #19736
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Quote:
Originally Posted by wrapped
Check the thread ,CHASSIS COACH BATTERY VOLTAGE , its a very good explanation and test procedure. The BIM is what isolates your coach battery from your chassis battery. When plugged into shore power you should hear a click up fr every 30 to 45 minutes and see both battery voltages the same then hear click again and chassis battery drop to around 12.6 or 12.8 also try using your emergency start button on dash,if engine starts check chassis battery voltage should go up to about 14.4
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Had trickle charger going all night. Only made it to 2.4v. Won’t emergency start. Going to jump it so I can move it and then the meter will come out
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03-13-2021, 04:57 PM
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#7
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Junior Member
Brand: Thor Motor Coach
Model: Challenger 37 FH
State: Texas
Posts: 18
THOR #19736
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Well damn. I don’t remember turning the inverter off but that did the trick. 🤦*♂️🤷*♂️ Thanks for the responses.
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03-13-2021, 06:11 PM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 696
THOR #13399
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Great, those are the best kind of problem/solutions.
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03-13-2021, 07:23 PM
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#9
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Quote:
Originally Posted by jmoffroad66
Well damn. I don’t remember turning the inverter off but that did the trick. 🤦*♂️🤷*♂️ Thanks for the responses.
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What does an inverter have to do with a dead chassis battery?
An inverter is connected to the house battery bank and takes the 12 VDC and inverters to 120 VAC for use in the coach. Some inverters also have an integral charger but that would charge the house battery bank which was apparently already being charged since it was 13.6 VDC by your first post.
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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03-13-2021, 09:40 PM
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#10
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Junior Member
Brand: Thor Motor Coach
Model: Challenger 37 FH
State: Texas
Posts: 18
THOR #19736
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Chassis battery dead
Quote:
Originally Posted by 16ACE27
What does an inverter have to do with a dead chassis battery?
An inverter is connected to the house battery bank and takes the 12 VDC and inverters to 120 VAC for use in the coach. Some inverters also have an integral charger but that would charge the house battery bank which was apparently already being charged since it was 13.6 VDC by your first post.
[emoji782][emoji782][emoji782]
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I have no idea but everything is back to normal. I’m still new to how the electrical system operates. Been roughly 7hrs since the initial problem and the battery is reading 13.1v.
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03-13-2021, 09:44 PM
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#11
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Glad ro read that things are looking better. 
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04-27-2021, 12:53 AM
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#12
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Senior Member
Model: 25.2 Axis
State: Arizona
Posts: 839
THOR #3471
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Anyone move their axis cab battery for better access
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11-07-2022, 05:19 PM
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#13
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Junior Member
Brand: Thor Motor Coach
State: Newfoundland
Posts: 13
THOR #21119
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Hi. My chassis battery died after two days still connected to shore power but I have the house batteries removed for storage. Any ideas on the reason.
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11-08-2022, 12:31 AM
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#14
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Site Team
Brand: Thor Motor Coach
Model: ACE 27.1
State: Florida
Posts: 14,389
THOR #7035
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Quote:
Originally Posted by Hurricanejohn
Hi. My chassis battery died after two days still connected to shore power but I have the house batteries removed for storage. Any ideas on the reason.
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How old is the battery?
Water level?
Load tested?
Stuff left plugged into power outlets on the dash?
__________________
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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11-08-2022, 09:45 AM
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#15
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Junior Member
Brand: Thor Motor Coach
State: Newfoundland
Posts: 13
THOR #21119
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Battery is 2 years old, water level good, load tested ok and nothing plugged in....I am guessing the BIM is bad or I have a parasite load on the battery.
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11-08-2022, 12:40 PM
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#16
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Senior Member
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 1,158
THOR #9178
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Quote:
Originally Posted by jmoffroad66
Well damn. I don’t remember turning the inverter off but that did the trick. [emoji1751]*[emoji3603][emoji1745]*[emoji3603] Thanks for the responses.
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Did you have the charger off also?
My charger button is directly above the inverter button
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11-08-2022, 02:14 PM
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#17
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Junior Member
Brand: Thor Motor Coach
State: Newfoundland
Posts: 13
THOR #21119
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Quote:
Originally Posted by lwmcguir
Did you have the charger off also?
My charger button is directly above the inverter button
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I am not sure what you mean by charger button, can you add a picture...
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11-08-2022, 02:59 PM
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#18
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Senior Member
Brand: Thor Motor Coach
Model: Tuscany 42GX
State: Missouri
Posts: 1,158
THOR #9178
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I don't know what brand or series inverter you have so
All of mine have had both an inverter and charger button/switch very close together
They illuminate making it easy to see what is powered
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