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Old 01-01-2013, 05:54 AM   #1
Newmarboy's Avatar
Newmar Owners Club
Join Date: Oct 2010
Location: Lewisville, TX
Posts: 35
Question about battery disconnect

Okay, I have a 2008 Wrangler Unlimited that I pull behind my motorhome. My Jeep has the steering wheel lock so I have the have the key in accessory in order for the steering wheel to be unlocked.
My question is, and this may sound silly to some, is if I use a battery disconnect will the brake lights and running lights work? Heck, will the RVi braking system work with the battery disconnected since it plugs into the 12 volt receptacle?
I am connected to the toad with an umbilical cord to work the aux brake and lights when towing.
Sorry if this question seems silly but sometimes after a long day of towing, the battery on the jeep has run down and as always, it happens at the most inopportune times.

thanks in advance for any help.

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Old 01-01-2013, 06:54 AM   #2
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Entegra Owners Club
Join Date: Jan 2012
Location: Space Coast, FL
Posts: 2,554
Battery disconnect

Answer: Yes and no

1. The Jeep lights ( stop, turn, running lights) will light up, if correctly wired, powered by the RV.

2. The BrakeBuddy will not work thru the cigarette lighter if the battery is switched via a disconnect. You may have to provide a cig plug wired on the "hot" side of the disconnect or run a power line thru the pigtail from the RV.

Look at CoolTech.com for a wiring hookup for your Jeep lights.

I tow a 2012 Jeep JKU and I don't have to disconnect the battery, and I use an air brake setup for my toad so I don't have the same problems as you.

Dave & Debbie
2014 Anthem 44B
2012 Jeep Rubicon toad
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Old 01-01-2013, 08:01 AM   #3
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Newmar Owners Club
Join Date: Oct 2010
Location: Lewisville, TX
Posts: 35
Thanks for the reply. I was pretty sure the lights would work due to the wiring harness from the motorhome, but was not completely sure. As far as the aux brake, I have two 12 volt plus, one is a regular lighter plug that has no power when the ignition switch is off and the other is an "always on" plug that works even if the switch is in the off position. I guess I need to find out if that plug will work if I use a battery disconnect.
If it will, a battery disconnect will solve the problem. If not, I will need to look in another direction.
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