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07-18-2021, 03:20 PM
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#1
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Montana Fan
Join Date: Oct 2018
Location: Waco
Posts: 122
M.O.C. #22946
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Thinking about 3rd A/C, but is my rig pre-wired?
I'm thinking about installing 3rd A/C but not sure if my rig is pre-wired. How can I find out?
__________________
2012 3582RL Big Sky, Onan Gen, Solar Panels, Whirlpool W/D combo
2015 Ram 3500 DRW 4x4 6.7 Cummins (deleted and tuned) B & W Companion Hitch
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07-18-2021, 03:23 PM
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#2
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,691
M.O.C. #4831
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I am positive a 2012 is NOT pre-wired for a third A/C. Mine isn't. I assume you are thinking of putting it where the 12V fan lives. Take off the shroud and you will see there is nothing there for an A/C
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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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07-18-2021, 05:09 PM
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#3
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Montana Fan
Join Date: Oct 2018
Location: Waco
Posts: 122
M.O.C. #22946
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Quote:
Originally Posted by Carl n Susan
I am positive a 2012 is NOT pre-wired for a third A/C. Mine isn't. I assume oyu are thinking of putting it where the 12V lives. Take off the shroud and you will see there is nothing there for an A/C
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Looking at where the fan is in the kitchen.
__________________
2012 3582RL Big Sky, Onan Gen, Solar Panels, Whirlpool W/D combo
2015 Ram 3500 DRW 4x4 6.7 Cummins (deleted and tuned) B & W Companion Hitch
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07-20-2021, 11:36 AM
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#4
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Those that are prewired for a 3rd AC will have a white juction box in the ceiling right next to the fan and a little label on it telling you the wiring is there.
__________________
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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07-20-2021, 05:55 PM
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#5
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Montana Fan
Join Date: Oct 2018
Location: Waco
Posts: 122
M.O.C. #22946
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Quote:
Originally Posted by DQDick
Those that are prewired for a 3rd AC will have a white juction box in the ceiling right next to the fan and a little label on it telling you the wiring is there.
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In the ceiling under something or exposed?
__________________
2012 3582RL Big Sky, Onan Gen, Solar Panels, Whirlpool W/D combo
2015 Ram 3500 DRW 4x4 6.7 Cummins (deleted and tuned) B & W Companion Hitch
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07-20-2021, 06:41 PM
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#6
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,898
M.O.C. #24086
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If your rig is pre-wired for a 3rd AC you will have an electrical cover plate in the ceiling next to the ceiling fan
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07-20-2021, 06:51 PM
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#7
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Montana Fan
Join Date: Oct 2018
Location: Waco
Posts: 122
M.O.C. #22946
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Well...don't got anything like that.
__________________
2012 3582RL Big Sky, Onan Gen, Solar Panels, Whirlpool W/D combo
2015 Ram 3500 DRW 4x4 6.7 Cummins (deleted and tuned) B & W Companion Hitch
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07-25-2021, 07:29 PM
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#8
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Montana Fan
Join Date: Sep 2018
Location: Terry
Posts: 158
M.O.C. #22698
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3rd AC
Quote:
Originally Posted by whitesub93
I'm thinking about installing 3rd A/C but not sure if my rig is pre-wired. How can I find out?
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As I understand, with a 3rd AC, you can still only run 2 at a time, i.e. 2 in lower area or br and 1 in lr, unless you run a sep elec line. So f I can only run 2, why have the 3rd?
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07-25-2021, 10:00 PM
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#9
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,691
M.O.C. #4831
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You can run three A/Cs on 50 amp service as long as you spread them over the two buses (i.e. 2 on one and 1 on the other)
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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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07-26-2021, 12:03 AM
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#10
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Seasoned Camper
Join Date: Sep 2017
Location: Lake Havasu City
Posts: 93
M.O.C. #20488
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If you are in a situation where 2 AC units can not cool your rig, you are not doing something right. Use a portable cooler, or some other device (fans) I know campground have iffy electric. 3 AC units will overload their ckts. Swamp coolers work when there is low Humidity, and AC's work when it is high. If you are in Texas, Arizona and other dry states you need to think differently. Good luck
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Odd Job Al
2012 Montana Mountaineer 295RKD
2006 Dodge Megacab 2500 5.9 Diesel
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07-29-2021, 04:33 PM
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#11
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New Member
Join Date: Aug 2020
Location: Dallas
Posts: 5
M.O.C. #26833
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I rigged a LG portable (on wheels) unit to the small slide up window (exhaust tube from unit to the window) in the mid dinning table slide out section. 600 bucks but can remove it during the winter time and it has WiFi so I can turn it on when flying back to Dallas and cool the rig down from 98 to about 74 without the two main units turned on. I live in it 10 days a month year round. Upon getting in the rig I use two box fans to blast the cold air in the mid kitchen area up into the FL space and into the back bedroom....helps cycle the cold air around and in about 1.5 to 2hrs the entire rig is down to 70 or so when its 100 outside. Never need the fans the rest of the time Im there.
Last week it was 100+ and humid - rig was at 65-67 degrees with the LG set at 65 and the other two thermostats set at 70.... got down to 64 a few mornings in the back king bedroom according to my stick up Temp Gauges. Really allows the main units to cycle and take a break vs. running 24/7. No clue what time early morning they stop running given the 70 degree setting but they kick back on around 9am or so and have no problem maintaining 69-70 all day long.
LG is designed for a 700sqft "room" and has great reviews. 14kBTUs and dual inverter/compressors work so well that it truly does not collect water that needs to be dumped/drained. Used it two summers now and never a drop in the reservoir.
Hope it helps.
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07-29-2021, 04:55 PM
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#12
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Montana Fan
Join Date: Oct 2018
Location: Waco
Posts: 122
M.O.C. #22946
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Quote:
Originally Posted by MBDismore
I rigged a LG portable (on wheels) unit to the small slide up window (exhaust tube from unit to the window) in the mid dinning table slide out section. 600 bucks but can remove it during the winter time and it has WiFi so I can turn it on when flying back to Dallas and cool the rig down from 98 to about 74 without the two main units turned on. I live in it 10 days a month year round. Upon getting in the rig I use two box fans to blast the cold air in the mid kitchen area up into the FL space and into the back bedroom....helps cycle the cold air around and in about 1.5 to 2hrs the entire rig is down to 70 or so when its 100 outside. Never need the fans the rest of the time Im there.
Last week it was 100+ and humid - rig was at 65-67 degrees with the LG set at 65 and the other two thermostats set at 70.... got down to 64 a few mornings in the back king bedroom according to my stick up Temp Gauges. Really allows the main units to cycle and take a break vs. running 24/7. No clue what time early morning they stop running given the 70 degree setting but they kick back on around 9am or so and have no problem maintaining 69-70 all day long.
LG is designed for a 700sqft "room" and has great reviews. 14kBTUs and dual inverter/compressors work so well that it truly does not collect water that needs to be dumped/drained. Used it two summers now and never a drop in the reservoir.
Hope it helps.
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Do you have the model number? I know the heat your talking about, I'm south of you in the Waco area.
__________________
2012 3582RL Big Sky, Onan Gen, Solar Panels, Whirlpool W/D combo
2015 Ram 3500 DRW 4x4 6.7 Cummins (deleted and tuned) B & W Companion Hitch
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