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Old 05-13-2015, 10:19 AM
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Battery disconnect for flat towing

2014 Rubicon unlimited:
We plan to flat tow it and was told that the battery should be disconnected to prevent the odometer from registering the miles.

Second reason for battery disconnect:
We will have an additional braking system - this braking system will power the brake lights independent of the Jeeps electrical power source.

So. . .for normal driving operation:
Will a 100 continuous amperage (500 amp surge) battery disconnect switch be sufficient?
Here is the one I'm looking at: Flaming River Battery Disconnect

And, lastly, is there anything else I should consider in this action plan?

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Old 05-13-2015, 12:33 PM   #2
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I was talking with a guy that tows his Jeep behind his diesel pusher and this is what he attached to the negative side if the battery.

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Old 05-13-2015, 02:23 PM   #3
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I have this same one. easy to install.
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Old 05-13-2015, 02:46 PM   #4
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Your mileage won't register unless you plan on towing your Jeep with the key in the "On" position.

What brake system are you planning on using? Most need battery power.

You need to consider the unlikely possibility of your Jeep coming unhitched from it's tow vehicle. My supplemental brake system design keeps the Jeeps battery charged, solves the brake/turn lamp override issue you mention, and applies the brakes if the Jeep comes unhitched.
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Old 05-13-2015, 03:47 PM   #5
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Wranglers are the rare car that does not have a locking steering wheel, so you don't need to put the key in the on posistion. Brake lights are another thing. I will leave that in your good hands.
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Old 05-13-2015, 07:07 PM   #6
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I tow my 2012 JK behind my Ford diesel van. I have a battery shut off using a key next to it. My supplemental braking is a US Gear setup. It has a vacuum pump to assist the brakes since the engine isn't running. Works great, van stops even better when I'm towing.
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Old 05-15-2015, 08:41 AM
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Quote:
Originally Posted by ssyam69 View Post
I was talking with a guy that tows his Jeep behind his diesel pusher and this is what he attached to the negative side if the battery.

Attachment 2179993
That looks like the simpler method. After inspecting the battery connections on my JK, I'd rather not have to cut into the cable.

Supplemental braking system: undecided at the moment.
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Old 05-15-2015, 08:50 AM   #8
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They sell something similar to the switch at walmart that doesn't look like a electric chair switch. It has a green screw knob that cuts the power and I've used one on a car I garage alot for a few years.
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Old 05-15-2015, 08:59 AM   #9
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Maybe these links will help you a bit. There may be more to your electrical towing setup than simply disconnecting the battery. We tow our '13 JK all the time and I never disconnect the battery or pull a fuse.

Towing a Vehicle - www.rv-camping.org

Towed Vehicle Supplemental Brakes

US Gear Unified Tow Brake Review Including JK Install Photos
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Old 05-15-2015, 10:07 AM   #10
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Originally Posted by Off Pavement View Post
Maybe these links will help you a bit. There may be more to your electrical towing setup than simply disconnecting the battery. We tow our '13 JK all the time and I never disconnect the battery or pull a fuse. Towing a Vehicle - www.rv-camping.org Towed Vehicle Supplemental Brakes US Gear Unified Tow Brake Review Including JK Install Photos
I have a 12 JKR that I flat tow and don't disconnect the battery or pull a fuse either. I have supplemental braking so need battery power. You get this with the key turned to the first position and the speedometer won't register miles. If you turn the key to the second position, before start, the miles will register. Don't ask me how I know. Always started when I got to my destination after hundreds of miles. Don't know if they wired it to charge the battery while towing.
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Old 05-15-2015, 10:08 AM
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Originally Posted by Off Pavement View Post
Maybe these links will help you a bit. There may be more to your electrical towing setup than simply disconnecting the battery. We tow our '13 JK all the time and I never disconnect the battery or pull a fuse.

Towing a Vehicle - www.rv-camping.org

Towed Vehicle Supplemental Brakes

US Gear Unified Tow Brake Review Including JK Install Photos
These links look like just the ticket.
My next question was - and maybe someone can answer it for future questioners: Is the 2014+ JK equipped with "electric hydro-boost power brakes" or "vacuum assist power brakes"?

(now excuse me while off I go to read up on those great links)
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Old 05-16-2015, 02:13 AM   #12
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Originally Posted by bighatnohorse View Post
These links look like just the ticket.
My next question was - and maybe someone can answer it for future questioners: Is the 2014+ JK equipped with "electric hydro-boost power brakes" or "vacuum assist power brakes"?

(now excuse me while off I go to read up on those great links)

the jeep jk has a vacuum boost system. the unit sits in the front bumper.

i have a cooltech tow harness kit. it came with a slick battery disconnect but i didn't install it as i didn't see a need for it.

i flat tow my 2015 jku with the readybrute elite system and the readybrake breakaway. neither of these systems uses the battery for anything.
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Old 05-16-2015, 07:59 AM   #13
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the jeep jk has a vacuum boost system. the unit sits in the front bumper...
While the brakes are a vacuum assist design, the vacuum canister behind the front bumper is designed to provide additional vacuum under acceleration and other times when vacuum may be low, but the actual brake booster is attached to the firewall. The main vacuum line to it can be seen in this picture where the supplemental brake system vacuum pump ties into the line with the 'T' fitting. The brake fluid reservoir is attached to the booster...

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Old 05-16-2015, 08:38 AM   #14
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I just rigged my 2015 JK for towing

As others have said, the newer Wranglers do not have a steering wheel lock, so no need to turn the ignition on.

The odometer does not register miles when towing my Wrangler.

You can buy a nice plug-n-play tow vehicle wiring kit for the JKs for about $80 bucks. The wiring harness in the kits plugs into the tail light wiring, and contains diodes so that the towing vehicle will not back-feed the Wrangler's electrical system (other than the tail lights). So there is really no need to isolate the Wrangler's battery.

If you do want to install a battery isolation switch (say to prevent parasitic loads from draining your battery when the Jeep is being stored or not being used), you can pick one up at Harbor Freight for about five bucks what works fine. http://www.harborfreight.com/battery...tch-97853.html

Most supplemental braking systems for towed vehicles require electrical power, but the NSA Ready Brute tow bar which I have includes a mechanical surge brake that uses an aircraft cable to mechanically apply the Wrangler's brakes - thus no battery power needed and no big supplemental braking unit to install in the driver's floor every time I tow.

So with my setup, I just install the tow bar and safety cables between the tow vehicle and the Jeep, clip the aircraft cable brake line to the tow bar's surge brake, plug in the lights to the tow vehicle, put the Wrangler's manual transmission in gear (or automatic tranny in park) and shift the transfer case to neutral, and off I go with the Jeep key in my pocket. When I get where I am going, the Jeep's battery is in the same state of charge as when I started the trip.

Doesn't get any easier than that. Just remember to never try backing up with a toad attached!

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