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08-31-2021, 12:19 AM
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#1
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New Member
Join Date: May 2021
Location: Wallace
Posts: 3
M.O.C. #28850
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No DC Power to 5th Wheel
Installed new batteries, converter tests as running properly, checked reverse polarity fuses, and still no dc power to 5th wheel. Any ideas?
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08-31-2021, 12:36 AM
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#2
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,571
M.O.C. #23668
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What year and model do you have? Does it have a battery disconnect? You might check it to see if it's in the correct position. If you can pull the key out it's off.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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08-31-2021, 12:41 AM
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#3
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New Member
Join Date: May 2021
Location: Wallace
Posts: 3
M.O.C. #28850
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2014 Montana RL3400. Have checked battery disconnect in both positions.
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08-31-2021, 05:19 AM
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#4
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Montana Master
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,727
M.O.C. #7992
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I'm assuming you have DC when plugged into AC shore power? Sounds like it's time to get the old meter out and start tracing. If you checked the battery disconnect just by operating it I'd start there with my meter. Others have reported the switch going bad regardless of the key position.
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2006 3000RK
2009 Ram 2500
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08-31-2021, 08:58 AM
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#5
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Montana Master
Join Date: Mar 2019
Location: Milwaukie, OR
Posts: 1,571
M.O.C. #23668
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I agree with Jim. With new batteries you should have functioning 12v to the coach with or without a good converter...as long as the new batteries are charged. If you're plugged into shore power then a functioning converter will power the coach with or without batteries. So if you're sure that the converter is giving full output AND you have fully charged batteries, then the power is being short-stopped somewhere. The cutoff switch is the first place to check. Are there any master fuses to check? Has there been any surges that might have blown the 12v fuses in the control center? Just spit-ballin'
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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08-31-2021, 09:17 AM
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#6
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Montana Master
Join Date: Dec 2009
Location: Sebring
Posts: 3,669
M.O.C. #9969
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You did check the reverse polarity fuses with a meter?? Not just eyeballing them??
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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08-31-2021, 02:26 PM
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#7
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,898
M.O.C. #24086
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IF...
No DC power from battery. Good when on Shore power.
Take a multimeter. On shore power, check each post of your red 50A self resetting circuit breakers near your batteries. They should all read the same (about 12.4vdc).
Now remove shore power. Check them again.
Which ever one is NOT showing 12vdc on the post, it is bad. Replace it.
Note: charging is also possible via the 7 way cable from your tow vehicle. It could be supplying power on the same (good) side of the breaker.
Buy Bussmann 50A self resetting circuit breakers. Very reliable. You can get them at your local auto parts store.
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Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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08-31-2021, 07:49 PM
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#8
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,774
M.O.C. #12947
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If you have hydraulic leveling on your rig, instead of replacing the 50 amp breaker with another 50 amp breaker, upgrade it to the Lippert recommended 80 amp breaker and this will probably solve your problem.
https://www.amazon.com/Bussmann-CB18...omotive&sr=1-5
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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09-10-2021, 07:02 AM
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#9
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Montana Fan
Join Date: Jun 2020
Location: Liberty Hill
Posts: 139
M.O.C. #26548
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Had the same issues a time or two and it turned out to be the GFI in the bathroom. Kept tripping. Replaced it with one from Lowes and never had another problem. Now carry a spare just in case.
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