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02-08-2021, 04:02 AM
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#1
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Montana Master
Join Date: Apr 2016
Location: Auburn
Posts: 879
M.O.C. #18474
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Cold weather jack problem identified
Most of you know that we're on our second 3790 and that our first one was traded back last April. I had done a LOT of mods to our other one including the auto resetting breaker upgrade as we cold weather camp. However our last trip out I had a problem with the breaker tripping when trying to load up and leave the campground. I didn't have a chance to look at in until about a couple of weeks ago. This one was wired at the factory. So, take a look at all of your wiring if you have a auto resetting breaker that trips during cold weather operation. Notice the dark green arrow is the main battery cable coming from the battery which "should" go to the 80 or 100A breaker, but no, it was ran through a 50A first! The lime green wire is the one going to the hydraulic pump. Follow the wires.....
__________________
2020 Montana 3790RD Legacy EditionOnan, TST TPMS, TrailAir pin, Discs,
2013 F350 DRW 4x4 CC LBViair 10007, Ride-Rites, Westin HDx, 12k Smittybilt
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02-08-2021, 05:14 AM
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#2
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,140
M.O.C. #25165
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My 2019 3791RD was wired the same way. I moved the wire to the other side of the first 50 amp self reset, then put an 80 amp manual reset breaker between it and the hydraulic pump. Essentially, the positive feed goes straight to the 80 amp that way now. Had to order a 12" jumper cable to accomplish this.
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Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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02-08-2021, 09:46 AM
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#3
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Montana Master
Join Date: Dec 2009
Location: Sebring
Posts: 3,658
M.O.C. #9969
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No one ever said that the KeyStone Techs were Electricians.
__________________
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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02-08-2021, 10:25 AM
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#4
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,952
M.O.C. #5651
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Quote:
Originally Posted by RMcNeal
My 2019 3791RD was wired the same way. I moved the wire to the other side of the first 50 amp self reset, then put an 80 amp manual reset breaker between it and the hydraulic pump. Essentially, the positive feed goes straight to the 80 amp that way now. Had to order a 12" jumper cable to accomplish this.
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Wouldn't this provide power to the rest of the coach with NO breaker in the line?
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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02-08-2021, 11:08 AM
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#5
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,362
M.O.C. #4831
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Where does the lower wire from the right side of the 80 amp CB do (go to)? It would seem the only thing that 80 amp breaker should power is the pump. It can't be an input 12V feed as that is what the left side one is. Asking for a friend.
One of the new improvements for Montanas is the 80 amp CB. Too bad they didn't teach the installers how it should be wired.
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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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02-08-2021, 01:43 PM
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#6
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Montana Master
Join Date: Jan 2005
Location: North Ridgeville
Posts: 20,229
M.O.C. #2839
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Mine was wired right.
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02-09-2021, 02:37 AM
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#7
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Montana Master
Join Date: Apr 2016
Location: Auburn
Posts: 879
M.O.C. #18474
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Quote:
Originally Posted by Carl n Susan
Where does the lower wire from the right side of the 80 amp CB do (go to)? It would seem the only thing that 80 amp breaker should power is the pump. It can't be an input 12V feed as that is what the left side one is. Asking for a friend.
One of the new improvements for Montanas is the 80 amp CB. Too bad they didn't teach the installers how it should be wired.
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That remains a mystery. It goes into the belly through a hole in the frame behind the brake actuator....
__________________
2020 Montana 3790RD Legacy EditionOnan, TST TPMS, TrailAir pin, Discs,
2013 F350 DRW 4x4 CC LBViair 10007, Ride-Rites, Westin HDx, 12k Smittybilt
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02-09-2021, 04:17 AM
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#8
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Montana Master
Join Date: Oct 2019
Location: Jacksonville
Posts: 2,140
M.O.C. #25165
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Quote:
Originally Posted by twindman
Wouldn't this provide power to the rest of the coach with NO breaker in the line?
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Not in my case. There was 2 additional wires on the 50 amp breaker besides the hydraulic pump. Moving the hydraulic pump to the supply side of the 50 amp left the other 2 on the protected side and the hydraulic pump is supplied straight from the battery to the 80 amp breaker now.
__________________
Robert & Diana McNeal
2019 Montana Legacy 3791RD 20th Anniversary Edition
2014 F350 4x4 6.7L SRW
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02-09-2021, 10:07 AM
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#9
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,362
M.O.C. #4831
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Quote:
Originally Posted by Golfmedik
That remains a mystery. It goes into the belly through a hole in the frame behind the brake actuator....
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Oops, brain fade on my part. That wire goes to the 12V fuse panel and converter. Duh!
__________________
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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02-09-2021, 06:38 PM
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#10
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Montana Master
Join Date: Apr 2016
Location: Auburn
Posts: 879
M.O.C. #18474
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Quote:
Originally Posted by Carl n Susan
Oops, brain fade on my part. That wire goes to the 12V fuse panel and converter. Duh!
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DUH!!! Yes it does....geez!!! I don't feel so smart now 
__________________
2020 Montana 3790RD Legacy EditionOnan, TST TPMS, TrailAir pin, Discs,
2013 F350 DRW 4x4 CC LBViair 10007, Ride-Rites, Westin HDx, 12k Smittybilt
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02-12-2021, 01:51 PM
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#11
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Montana Master
Join Date: Apr 2016
Location: Auburn
Posts: 879
M.O.C. #18474
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Quote:
Originally Posted by Carl n Susan
Oops, brain fade on my part. That wire goes to the 12V fuse panel and converter. Duh!
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Actually, it goes to the cutoff switch and then to the converter.
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