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Old 07-02-2013, 02:25 PM   #11
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Pulling the fuse pulls the power from the brake light switch so the toad battery won't overpower the lamps from the coach/towing vehicle when using supplemental brake systems. It keeps the turn signals working properly on the toad. Also, it prevents the dreaded dead battery that many folks experience when towing as the brake lamps use more power than most suspect. The alternative is a charge line from the tow vehicle to to towed vehicle.

Many vehicle mounted supplemental brake systems incorporate a brake lamp circuit intercept that removes the requirement for pulling the fuse. I believe most floor mount systems don't account for the brake light switch so pulling the fuse is the solution.
I bought a Jeep tow harness adapter from Mopar. It plugs into the existing wiring harness on the Jeep and has a 7 pin plug that goes to the motorhome. No battery disconnecting required.
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Old 07-02-2013, 03:56 PM   #12
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I bought a Jeep tow harness adapter from Mopar. It plugs into the existing wiring harness on the Jeep and has a 7 pin plug that goes to the motorhome. No battery disconnecting required.
Tom and Kat...

I steered away from this adapter when I was setting up my JK as I couldn't figure how it could work with a supplemental brake system and a battery disconnect of some sort.

According to the Mopar website, that harness "Includes a underhood wiring disconnect..." so I wonder what that is?

Are you using a supplemental brake system? If so, what is the mechanism to isolate the brake light switch only when being towed to keep the Jeeps brake lights off? If not isolated and the brake pedal is depressed, the brake lights should come on overriding the towing vehicle, thereby canceling the turn signal. You still got brake lights, just no turn signals unless the brakes are not activated.

Please let me know how yours works.
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Old 07-02-2013, 04:16 PM   #13
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I use a Ready Brake tow bar (Readybrake RV Tow Bars and RV Surge Braking Systems for Car Towing - NSA RV Products). Used this tow bar, and the older model for my previous Jeep, for thousands of miles with no problems whatsoever. The Mopar harness taps into the turn, brake and tail light harness (with factory connectors) under the kick panel on the passenger side. The end of the connector sits just in front of the radiator. You simply plug the supplied 6 foot harness into the plug at the radiator and the other end (7 pin round) into the motorhome. it uses 12 volt from the motorhome to activate the lights in concert with the motorhome lights without using the Jeep battery. Getting ready to go consists of hooking up the tow bar, plugging in the harness, putting the transfer case in neutral and driving away.
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Old 07-02-2013, 04:45 PM   #14
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I've towed a 2000, 2004 and now a 2011 (all Wranglers) thousands of miles with no problems. Just leave it in park, put the transfer case in neutral, unlock the steering column and you're ready to go.
We have a 2001 Jeep Cherokee Sport being towed by a Coachmen Mirada. We do exactly what is said above. Have had no problem at. We use a Brake Buddy that we bought online from a bidding site for about $300 less than retail. Works great and easy to hook up both Jeep and buddy.
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Old 07-02-2013, 07:03 PM   #15
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You guys still haven't explained electrically how it doesn't use the Jeep battery when the service brake is operated, just that it works... I want the details
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Old 07-02-2013, 07:09 PM   #16
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The harness isolates the electric signal coming from the motorhome to the Jeep from the electrical system in the Jeep through a series of diodes built into the coupler. The 12 volt from the motorhome runs the rear lights in the Jeep without bleeding into the Jeep's electrical system.
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Old 07-02-2013, 07:23 PM   #17
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I'm dense I guess. Still don't see how a diode would keep the brake lamps from coming on when the service pedal is activated. The diode is in the circuit all the time from what you have described, so what keeps the diode from blocking the brake lights when you are not plugged into the wiring harness?

NSA addresses this on their install instructions but the way you make it sound, it doesn't work that way... http://www.readybrake.com/instructions/BCD-110.pdf
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Old 07-03-2013, 01:42 AM   #18
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towing a jeep

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I'm dense I guess. Still don't see how a diode would keep the brake lamps from coming on when the service pedal is activated. The diode is in the circuit all the time from what you have described, so what keeps the diode from blocking the brake lights when you are not plugged into the wiring harness?

NSA addresses this on their install instructions but the way you make it sound, it doesn't work that way... http://www.readybrake.com/instructions/BCD-110.pdf
ok thanks a lot for all the info. I have a 2012 Rubicon and I guess the steering wheel doesn't lock, so this way I don't have to lift hood and disconnect battery only makes since. I use a ready brute tow bar and a ready brake cable that pulls brake peddle, works good for this little guy. Pete
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Old 07-03-2013, 07:12 AM   #19
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Let me try to shed some light on the subject with my setup. I have the Blue Ox EZ wiring kit with diode controller for the Jeep Wrangler. This kit has OEM connectors which adapt to the rear tail light and I mounted the diode controller in the hitch storage area. It provides 20 feet of 4-wire which I routed to the front bumber to connect with my RV cable. The diode controller prevents the RV from back-feeding the Jeep electrical system. Here are my setup steps:

1. Remove Brake fuse in Jeep (this prevents tailights being activated from brake buddy when peddle is depressed)
2. Connect tow-bar, safety cables
3. Connect RV-7 to 4-wire cable (jeep tail lights now activated by RV power)
4. Shift transfer case to nuetral, put Jeep in gear (manual tranny)
5. Place Patriot Brake buddy on floor, plug 12V into console and operate setup procedure
6. No key in ACC position because 2012 does not have steering lock
7. ready to go.

One additional option you have is to use the Auxillary 12V wire in the RV-7 trailer plug, this can be routed to the Jeep battery to keep it charged from RV power. I currently don't have this in my setup, but if I start noticing significant power drain on the Jeep from the brake buddy on long trips then I may add this to my cable. The Patriot brake system has an internal battery, it only uses the 12V to keep it charged.

I hope this helps
Regards...
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Old 07-03-2013, 10:08 AM   #20
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I tow a 2012 Jeep Wrangler. Was told to un plug the YELLOW fuse. This shuts down the electronics that prevent adding mileage when towing. Hve a Road master set up for towing B/hind 2012 373ds.
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