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Old 04-04-2016, 07:53 PM   #1
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Join Date: Dec 2015
Posts: 1
Brake light wiring and power from coach

I have a 2015 Jeep Wrangler and want to understand how to get all the wiring from my coach to my Jeep in one harness and one plug mounted to the Blue Ox base plate. I have not decided if I am going with the Mopar or CoolTech brake lighting harness yet. I believe I am going to purchase the SMI Stay-in-Play brake controller. I just don't understand the plugs that run to the front of the Jeep from either the CoolTech or the Mopar harness. Neither of these seem to have a mounting plate with a plug that incorporates power from my coach to either charge the jeep battery or at least power the controller for the SMI brake controller. Ok, I'm fairly sure I am over complicating this but I only want to do this once. Every Mopar harness installation I see just has a pigtail sticking out from the grill with their propriety plug on the end. That look, as well as not having a cover over the connector does not work for me. It appears the CoolTech at least has a normal mounting plug that may mount directly to the Blue Ox mounting tabs? Is this a standard 4-5-6? pin plug? Can I get a coiled 7 pin to Cooltech plug instead of the straight? Does this cable provide constant voltage to my jeep from the coach? Just to recap what I have:
2013 Tiffin
2015 Jeep Wrangler
Blue Ox base plate (not installed yet) Still in storage as it is still snowing!!
Blue Ox tow bar
Thinking about SMI brake controller- but open for suggestions that are easy
Trying to figure out what wiring harness to purchase

Sorry for the long post.


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Old 04-04-2016, 08:25 PM   #2
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Location: Warren, Oregon
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If you have air brakes I would go with the Air Force One
SMI Air Force One Supplemental Braking System for Motor Homes with Air Brakes - Proportional SMI Tow Bar Braking Systems SM99243
2 stroker

2006 Country Coach Inspire 360 40ft Genoa Designer Series, Samsung 197 RR
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Old 04-04-2016, 09:27 PM   #3
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Steve, I recently mounted the Blue Oz baseplate to my 2015 Wrangler Unlimited. Basically a simple install, I took my time including spray painting the 4 drilled holes with black paint for extra protection. Dry time was more than what some here have claimed as total installation time.

I decided to go with the CoolTech harness since from all of what I have read on this forum, it is the simplest install of all the various wiring systems. No drilling into anything like all the other systems. I do still need to install it though, plan on snaking through the left frame back to front. It comes with a cast zinc 4 pin round Pollak connector. The umbilical between the RV and the Jeep will need a mating Pollak connector. It doesn't look like any of the 7 to 4 coiled cables use the right connector that interfaces with this Pollak connector. CoolTech does sell a straight umbilical that works though. I want to use a black connector on the Jeep (non if the round 4 pins are black) so I will probably go with a 7 to 6 pin coiled umbilical (etrailer looks like a good source.)

Haven't ordered a brake system yet, but am leaning to the RVI2.
Ron and Gerry
2004 Phaeton, 330 Hp Cat
2015 Wrangler Unlimited Sport or 1997 Sanger V210
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Old 04-05-2016, 10:08 AM   #4
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Posts: 531
I used the Hopkins light kit. It doesn't require any splicing or cutting. It came with a 4 wire flat and I cut that off and wired into a 6 pole round plug. Used one of the extra poles for the M&G alert light mounted in the coach.

Got the 7 to 6 coiled wire extension to connect coach to toad.
2007 Itasca Horizon 40FD, 2015 HD FLHTKL, 2012 Wrangler Sahara
2012 PT Crusader 255BHQ 2016 F-250 CC 4WD Diesel
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Old 04-05-2016, 12:05 PM   #5
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Location: DFW, Texas
Posts: 2,067

I liked the function of the Mopar harness, but I also didn't care for the pigtail sticking out of the grill. I cut off their connectors and changed to a standard 6 wire trailer plug mounted under the bumper. It works great and is easy to connect and disconnect. The Demco base plate came with a mounting bracket for the connector, but when you buy a trailer connector they also come with a bracket. Need to get new photos of the Jeep, I have since added a winch and light bar.

I also use the RVI2 brake. It is very easy to set up to tow each time. It is compact, light and works great. The only installation required on the Jeep is a single wire going to the break-away switch under the front bumper.
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2017 Phaeton 40IH Maroon Coral - Power Glide Chassis with IFS (05/17)
Previously '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'12 Jeep JK Wrangler Sport and/or '08 Honda Goldwing
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brake, light, power, wiring

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