Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×

Go Back   Montana Owners Club - Keystone Montana 5th Wheel Forum > MOC Technical Forums > Montana Problems, Problem Solving & Technical Help
Click Here to Login

Thread Tools Search this Thread Display Modes
Old 03-13-2021, 08:29 PM   #1
New Member
Join Date: Mar 2021
Location: Chesterfield
Posts: 1
M.O.C. #28363
2nd AC wired to master bedroom light switch


Has anyone had an issue with the rear a/c being wired to the light switch in the master bedroom? Let me explain. We purchased a 2021 377FL and after getting it home I have found that the rear a/c only works when the master bedroom light switch is on. When the switch is on the ceiling lights operate, as well as the thermostat in the master bedroom, and of course the a/c. When I turn the switch off the lights, the thermostat, and the a/c all turn off. I have a service appointment scheduled but I was just curious if anyone else has experienced the same issue. Thanks in advance for your responses.
crazyrv! is offline   Reply With Quote
Old 03-14-2021, 06:52 AM   #2
Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
Welcome to the MOC
It is new feature they added since it is cooler at night and you shouldn't need ac while sleeping.

Seriously it sounds like they grabbed the 12VDC from the wrong side of the switch.
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
jeffba is offline   Reply With Quote
Old 03-14-2021, 09:32 AM   #3
Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
We had a problem on our new 2007 with our refrigerator and some outlets working intermittently. After a lot of head scratching and troubleshooting, found out they were wired to the ceiling fan switch. Fan on, fridge and outlets worked. Fan off, no go.

Looks like they are still making the same type mistakes.
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
BB_TX is offline   Reply With Quote
Old 03-14-2021, 10:07 AM   #4
Site Team
DQDick's Avatar
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
Welcome to the forum! Sounds like a speed of assembly problem to me. Make them too fast and you wire on the wrong side.
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.
DQDick is offline   Reply With Quote
Old 03-14-2021, 12:03 PM   #5
Montana Master
jimcol's Avatar
Join Date: Dec 2007
Location: Kansas City, Missouri
Posts: 2,707
M.O.C. #7992
Send a message via AIM to jimcol Send a message via MSN to jimcol
Remove the switch. If you have multiple wires on the load side of the switch, one will be for the thermostat & one for the lights. Move the thermostat wire to the line side of the switch and it'll solve your problem. Now if they daisy chained the thermostat and ceiling lights, one wire on the line side of the switch, It becomes much more complicated and maybe best left for the dealer to fix.
2006 3000RK
2009 Ram 2500
jimcol is offline   Reply With Quote
Old 03-14-2021, 12:04 PM   #6
Montana Master
DutchmenSport's Avatar
Join Date: Oct 2018
Location: Anderson
Posts: 2,585
M.O.C. #22835
Ha! This is kind of interesting and humorous for me. Maybe a bit off topic, but trying to keep thing on the happy path .... I'm a computer code software tester, A previous company I worked for developed software code for Credit Unions. Their coding was so bad and they were getting push-back so hard from the different credit unions, that the company gave us all instructions that we could not use the term "defect" any more. Whenever there was a "defect" in the code, we'd have to find the work around. Once the work around was figured out, they put out a service bulletin and then call it an "enhancement." So, they were sending out weekly "Enhancement Bulletins" to all their clients.

Maybe, the feature of having the air conditioner wired to a light switch is not a manufacturing "defect." Maybe it's an "enhancement!" ????

Who you are right now is a sum total off all you use to be.
2019 Montana High Country 375FL
2014 Chevy Silverado Duramax, 6.6L Dually
DutchmenSport is offline   Reply With Quote

377fl, power issue, rear a/c, wiring

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

» Featured Campgrounds

Reviews provided by

Powered by vBadvanced CMPS v3.2.3

This website is not affiliated with or endorsed by Montana RV, Keystone RV Company or any of its affiliates. This is an independent, unofficial site.

All times are GMT -6. The time now is 02:27 PM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.