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06-18-2020, 12:10 PM
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#1
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Established Member
Join Date: Aug 2017
Location: Brighton
Posts: 20
M.O.C. #20316
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Fuse question
In a previous thread someone wrote: "When you put the battery back in, did you accidentally connect it backwards? If you did, even for a split second, you would have blown the reverse polarity fuses in the panel, and the CONVERTER will not charge the battery until those fuses are replaced." When we opened our camper up this spring we accidentally connected our battery backwards. We corrected that, but now the battery will not hold a charge - it is a new battery. My question is how do I know which fuses are the "reverse polarity fuses" when I look at my fuse panel? Any suggestions would be appreciated! 
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06-18-2020, 12:25 PM
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#2
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,363
M.O.C. #4831
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An upside down picture of the Reverse Polarity Fuses (4 @ 25 amps) are in this Thread. The fuses are not in the line along the bottom. They are up further on the converter.
https://www.montanaowners.com/forums...+polarity+fuse
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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06-18-2020, 12:43 PM
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#3
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Established Member
Join Date: Aug 2017
Location: Brighton
Posts: 20
M.O.C. #20316
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My fuse panel doesn't look like that one. I can't figure out how to post the picture of mine on this site. Our unit is a 2011 Keystone Mountaineer 345 DBQ 5th wheel. I have a feeling the reverse polarity fuses are with my converter and I have yet to locate that! All my fuses are lined up along the right side of the panel and all are 15's. Across the top are just the switches that you turn off or on. Thanks for your input - I'll be doing some research this weekend when I'm at our RV site.
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06-18-2020, 01:23 PM
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#4
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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How long do you leave the trailer disconnected from shore power? A fully charged battery in an rv can discharge in a day or two.
You said the battery will not hold a charge. Is it being charged by the camper.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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06-18-2020, 01:38 PM
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#5
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Montana Master
Join Date: Jun 2017
Location: POINTBLANK
Posts: 1,888
M.O.C. #19944
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Quote:
Originally Posted by Montana Man
How long do you leave the trailer disconnected from shore power? A fully charged battery in an rv can discharge in a day or two.
You said the battery will not hold a charge. Is it being charged by the camper.
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My bet, the fuses are blown on converter. I bet it's located under bathroom floor, behind basement wall.
__________________
 RAM 22' DRW 3500 Crew LB 40 gal reserve tank / RETRAX Bed Cover / 2020 373RD HC / IS / MOPEKA Tank Monitor / Furrion Side&Rear Cameras
Slide Toppers / EMS-HW50C / Sailun 85's
3rd AC / Dometic 320
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06-18-2020, 01:58 PM
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#6
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Montana Master
Join Date: Jun 2018
Location: Carson City
Posts: 2,017
M.O.C. #21963
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Quote:
Originally Posted by Ram Montana High Country
My bet, the fuses are blown on converter. I bet it's located under bathroom floor, behind basement wall.
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I suspect the same. I fixed a friend's once who did this. On his, nothing 12v worked so I was wondering where the op's battery is being charged. We need more input.
__________________
2016 3160, Legacy, Sailuns, Splendide 2100 xc vented, 1 1/2" axle lift blocks, disk brakes. 2014 Ram 3500 SRW SWB 4X4 6.7 Aisin Mega Cab, EBC slotted disks and brakes, Titan fuel tank.
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06-18-2020, 03:21 PM
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#7
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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On our 2010 our converter was located under the stairs, most easily accessed by taking out the basement wall.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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06-18-2020, 03:57 PM
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#8
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Established Member
Join Date: Aug 2017
Location: Brighton
Posts: 20
M.O.C. #20316
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Fuse question follow up!
The battery is stored indoors through the winter months we make sure it stays charged throughout this time. Our camper is parked year round at a camp ground - it is never moved. Earlier research I did suggests it is behind that basement panel everyone is talking about. Presently we have a charger hooked up to the battery and also we have an electric hookup. This remedy is working fine, but obviously we'd like to get to the root of the problem. The plan is to find someone who can get in and remove the basement panel to check for those fuses on the converter - hopefully this weekend that will happen. Thanks for everyone's suggestions!  WOW I got the picture of the fuse panel to post - i'm proud of myself!
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06-18-2020, 08:23 PM
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#9
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,689
M.O.C. #24086
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I'm not sure what fuse panel or converter you have, I have a Progressive Dynamics converter/breaker/fuse panel. When you take the cover off the reverse polarity fuses are right there.
Screen shot is from the troubleshooting manual.
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06-18-2020, 10:55 PM
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#10
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,363
M.O.C. #4831
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Quote:
Originally Posted by Daryles
I'm not sure what fuse panel or converter you have, I have a Progressive Dynamics converter/breaker/fuse panel. When you take the cover off the reverse polarity fuses are right there.
Screen shot is from the troubleshooting manual.
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This is an older Mountaineer with a WFCO power center. They use a separate converter usually hidden behind the basement wall.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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