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Old 03-26-2016, 05:44 PM   #1
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Tiffin Owners Club
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Jeep Wrangler Battery Disconnect Question

Here's my dilemma, I'm hoping someone else has been there and found the answer: I hooked up my 2011 Wrangler JK Sport to my 04 Allegro 30D. I went the traditional route with the diodes in the wiring. I'm using an Add-a- Brake 9700 by Roadmaster. Now, since the add-a-brake needs 12v, I tried it in the cigarette lighter outlet and everything worked fine. Then I figured I'd better heed the manual and disconnect the battery which then involved running an independent 12v line from the battery to the Add-a-brake. When I did that, the indicator light and warning buzzer in the MH dash panel no longer work. I can't get a straight answer from any Jeep service tech as to exactly why the battery must be disconnected. My theory is that the older models steering lock would be a factor so they stated that the ignition switch should be in the on position, keeping the steering unlocked, but draining the battery. Since my steering wheel does not lock, I don't see what all the fuss is to keep the battery connected. Roadmaster sells a switch to solve all this, but to mount this thing I'd have to be a contortionist!

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Old 03-26-2016, 06:26 PM   #2
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We tow a 2010 Wrangler. I installed the battery disconnect and use it regularly, however on a couple of occasions I have forgotten to disconnect the battery - no ill effects as far as I can tell. We use a Readybrake tow system so no electrical connecton required in Jeep. I used a Cool tech wiring harness for lighting. Works either way.

2014 Newmar Ventana 4037 / 4018
2015 Jeep Grand Cherokee Ltd.
1940 Chevrolet Pickup
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Old 03-26-2016, 08:05 PM   #3
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We tow a 2009 Wrangler and don't disconnect the battery. We don't have a steering lock either so there is no reason to disconnect it anyway. Towed from California to Yellowstone and back with no issues. Can't see why you would need to disconnect if you have no steering lock.
Rick and Patty
2006 Holiday Rambler 30PDD,Sani-Con,Sumo Solo Springs,5 Star,Radio Labs,
MagneShade,Progressive Surge Protector,EEZRV TPMS,2009 Jeep Wrangler
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Old 03-26-2016, 09:04 PM   #4
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Battery disconnect not needed.
Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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Old 03-26-2016, 09:32 PM   #5
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Location: Central Texas
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You do not have to disconnect the battery if your steering wheel does not lock. Even the jeep service managers do not realize that the steering wheel does not lock. Mine did not believe me so he went and checked the wranglers on the lot and low and behold none of their steering wheels locked either. So as a result no power is drained except the parasitic drain and how often do you not drive your jeep for a few days and the battery is not drained.
Same as you I dealt with the jeep CS and even talked to the engineers and they could not tell me why I had to disconnect the battery.
Sorry for the long post.
Carsten and Bridget
2015 Entegra Anthem 42 RBQ
2016 Expedition King Ranch
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Old 03-27-2016, 07:13 AM   #6
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What a Relief!

I want to thank each and every responder for their feedback. Only those of us who live with these dilemmas can understand just how important this info is to us, and how frustrating it is to not be able to get it from the so called "professionals" at the dealer service centers. Now if you'll excuse me, I have to go and remove my battery isolator!
Thanks again!
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Old 03-27-2016, 07:24 AM   #7
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Not sure if this is an issue, but on longer tows wouldn't the battery discharge with the brake system? If it is, you could add a charge circuit from the 7 pin on the coach.
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Old 03-27-2016, 07:37 AM   #8
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I have a 2011 wrangler and was looking to install my patriot braking system which requires battery to be connected. I was wondering the same thanks for the clarification. my professional would not answer the questions either. I think maybe cuz he was upset I didn't ask him to install all the stuff
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Old 03-27-2016, 09:14 AM   #9
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We flat-tow our 2012 Wrangler, using a Brake-Buddy system. There is a 12v receptacle in the center console, that is 'on' all the time. Put the transfer case in neutral, tranny in park, hook everything up, and away we go. No need to disconnect battery. Or turn the key on.

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battery, battery disconnect

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