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08-28-2021, 10:15 AM
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#1
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Montana Fan
Join Date: Oct 2018
Location: Grandview
Posts: 192
M.O.C. #22947
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Replacing trailer electrical box
I plan to replace my electrical box on my trailer. Do I have to disconnect my batteries? Or is it enough to turn of the battery switch on the trailer. Can I keep my 110 volt plugged in?
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08-28-2021, 10:37 AM
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#2
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,930
M.O.C. #20477
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Tommy,
What electrical box are you planning to replace? Your converter or power panel?
In general it is best to have all power off to do electrical work but it is not clear what you are doing.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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08-28-2021, 10:47 AM
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#3
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Montana Fan
Join Date: Oct 2018
Location: Grandview
Posts: 192
M.O.C. #22947
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Sorry about that, the electrical box where my 7pin wires comes in from the truck
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08-28-2021, 10:51 AM
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#4
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Montana Fan
Join Date: Oct 2018
Location: Grandview
Posts: 192
M.O.C. #22947
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The Pin Box electrical box.
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08-28-2021, 10:51 AM
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#5
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 3,930
M.O.C. #20477
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Tommy,
Since it is only 12 v you could get away with leaving power on but I would still recommend disconnecting. The box change should be a quick swap out.
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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08-28-2021, 10:56 AM
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#6
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Montana Fan
Join Date: Oct 2018
Location: Grandview
Posts: 192
M.O.C. #22947
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Thanks a lot Zack. The battery switch should turn of the 12 volt to the battery right??
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08-28-2021, 11:10 AM
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#7
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Montana Master
Join Date: Aug 2004
Location: Livermore
Posts: 5,145
M.O.C. #1920
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No, it shuts off to only some circuits. Even with the disconnect switch off, you still have power to hydraulics, CO detector among other things. You could check with your meter to make sure the circuit is dead, but it would be safest to disconnect the battery. Good luck.
__________________
Ron and Terrie Ames - MOC #1920/KF0NTA
2021Montana 3230CK Super Solar Legacy Package
2021 Ram 3500 Laramie Longhorn, BIM Charging
4x4, SRW, LB, Crew Cab, Pullrite 3900 Hitch
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08-28-2021, 12:09 PM
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#8
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,690
M.O.C. #24086
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In your battery compartment you can disconnect the blue wire from your terminals to disconnect your battery from the emergency brake system.
Trailer wiring diagram from ETRAILER
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08-28-2021, 12:19 PM
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#9
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Montana Master
Join Date: Oct 2018
Location: Anderson
Posts: 2,587
M.O.C. #22835
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Just be safe and unplug from shore power, and disconnect the ground at the battery. Why take ANY chances? But, if you short something, the most that will happen is you'll blow a fuse.
__________________
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
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08-28-2021, 12:34 PM
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#10
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Montana Fan
Join Date: Oct 2018
Location: Grandview
Posts: 192
M.O.C. #22947
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Thanks guys, what gauge is the electrical wires. Is it 12 or 14 . I need to buy the terminals to put on the wires in order to connect into my new box. The wires are now connected with wire nuts.
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08-28-2021, 10:49 PM
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#11
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,690
M.O.C. #24086
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I'm pretty sure the 12vdc feed line from the truck should be 10 gauge. I would use 10 gauge for the White ground wire also since it's carrying all the return current.
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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08-29-2021, 09:20 AM
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#12
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Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 7,166
M.O.C. #6433
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Quote:
Originally Posted by sunshine 1
Thanks guys, what gauge is the electrical wires. Is it 12 or 14 . I need to buy the terminals to put on the wires in order to connect into my new box. The wires are now connected with wire nuts.
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There are different size wires in that box. And some connections have 2 wires and some 3. You can open the cover and see. But I would just buy a bag of multiple size wire nuts to cover all needs. I replace my 7 pin power cord a few months ago, but do not remember exactly what nuts I used.
__________________
Bill & Patricia
Riley, our Golden
2007 3075RL (recently sold, currently without)
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09-01-2021, 05:32 PM
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#13
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Established Member
Join Date: Jun 2019
Location: Placerville
Posts: 26
M.O.C. #24256
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It wont kill ya but youll knock your head when it sparks. Just disconnect the neg for the duration
__________________
2005 297rks
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