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08-31-2022, 10:06 AM
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#1
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New Member
Join Date: Aug 2022
Location: Mesa
Posts: 2
M.O.C. #31547
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DC system
Hello, when connected to shore power all my electrical systems work fine. When disconnected from shore power nothing works. Even when connected to my truck everything is dead. However, the running lights on the trailer work. The batteries are charged. I have a montana 3790RD. Any help is appreciated
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08-31-2022, 10:38 AM
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#2
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,725
M.O.C. #7992
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It sounds like your battery disconnect switch is in the wrong position. It needs to be in the position where the key cannot be removed.
__________________
2006 3000RK
2009 Ram 2500
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08-31-2022, 11:09 AM
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#3
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,079
M.O.C. #20477
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The other problem could be a failed resettable cb right behind the battery bank. It is easy to check with a voltmeter.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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08-31-2022, 11:14 AM
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#4
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New Member
Join Date: Aug 2022
Location: Mesa
Posts: 2
M.O.C. #31547
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Thanks for your reply. The switch is in the correct position
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08-31-2022, 11:24 AM
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#5
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,079
M.O.C. #20477
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If you look at post 8 in this thread it will show a picture of the cbs.
https://www.montanaowners.com/forums...ad.php?t=87828
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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08-31-2022, 11:41 AM
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#6
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,890
M.O.C. #24086
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Carl wrote the perfect flow chart for troubleshooting 12vdc
https://www.montanaowners.com/forums...ad.php?t=86323
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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08-31-2022, 01:34 PM
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#7
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,355
M.O.C. #6433
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Quote:
Originally Posted by Wesolowskik@msn.com
Thanks for your reply. The switch is in the correct position
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Since your switch is in the correct position (meaning you can not pull the red handle out), then you need to check for voltage on all the auto reset circuit breakers near the battery. They should all have +12 vdc on both terminals.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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