Flat towing setup - Page 11 - 2014+ Jeep Cherokee Forums
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post #101 of 108 (permalink) Old 08-02-2016, 10:19 PM
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Thanks to all, I have installed the Roadmaster base plate kit and trailer light wiring for the flat tow setup. The light wiring kit from Hopkins fits perfectly. It also fit the Jeep Grand Cherokee 2011 to 2013 if I remember correctly. I had to order it directly from Hopkins but I didn't have to splice 1 wire. Piece of cake to install. We just got the Trailhawk v a c from Jeep after installing the new Flat Tow wire harness. The setup for this is absolutely horrible and I can't believe some engineer thought of this. If they expect people to put a fuse in and take it back out each time they tow as well as flip a hidden switch, I got a bridge to sell them. I'm going to install the SMI Air Force One brake controller this weekend and we should be done.

I'm going to post in another thread, but if this so called flat tow harness isn't used, the battery would die or become severely discharged from what I've read hence it's purpose. I know there are those that run a charge cable to the Jeeps battery so I may go that direction instead.

Thanks for the help and confidence guys, it was indeed a lot easier than I once thought

PS, In the Roadmaster base plate installation, it mentions needing to trim the bumper fascia where the tow hooks were removed in order to fit the base plate mount with runaway connectors through. I noticed that on our new 2016, that wasn't necessary as Jeep already took care of it. That may not be true on the 2015 or 2014, but it looks like they got the hint for 2015 so it made the job even a bit easier. Thanks Jeep
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Last edited by Bigtrace; 08-03-2016 at 06:39 PM. Reason: Added "PS" content
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post #102 of 108 (permalink) Old 08-03-2016, 05:35 AM
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Quote:
Originally Posted by Bigtrace View Post
Thanks to all, I have installed the Roadmaster base plate kit and trailer light wiring for the flat tow setup. The light wiring kit from Hopkins fits perfectly. It also fit the Jeep Grand Cherokee 2011 to 2013 if I remember correctly. I had to order it directly from Hopkins but I didn't have to splice 1 wire. Piece of cake to install. We just got the Trailhawk v a c from Jeep after installing the new Flat Tow wire harness. The setup for this is absolutely horrible and I can't believe some engineer thought of this. If they expect people to put a fuse in and take it back out each time they tow as well as flip a hidden switch, I got a bridge to sell them. I'm going to install the SMI Air Force One brake controller this weekend and we should be done.

I'm going to post in another thread, but if this so called flat tow harness isn't used, the battery would die or become severely discharged from what I've read hence it's purpose. I know there are those that run a charge cable to the Jeeps battery so I may go that direction instead.

Thanks for the help and confidence guys, it was indeed a lot easier than I once thought
Many of us have installed a switch in series with the fuse. You'll read about the various methods/locations in the threads about towing. A charge line is strongly recommended to keep the battery up since the kit activates EPS during the time you're towing your Jeep.

... RP
2015 Trailhawk
CherryRed&Black, V6, Uconn8.4-Navigation
Comfort/Convenience, ColdWeather, TrailerTow pkgs
Ordered 8/6
Status D1: 8/13, F: 8/26, I: 8/27, KZ: 9/2, KZM: 9/3
Arrived at Dealer 9/10, 42 days from order date.
Took Delivery Sept. 12, 2014.
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post #103 of 108 (permalink) Old 08-03-2016, 06:54 PM
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So the question is this: If you install a charge line from the RV back to the Cherokee, is the rest of this necessary if you just place the Cherokee's key in the "Run" position instead of the "ACC" position thereby turning everything on?? Is the power steering activated in the "run" position or does the vehicle have to be completely started and turned on? I'm reading some mixed messages about the whole harness issue. My understanding is that the harness is meant to save you from excessive battery drain because the vehicle has to be in the "Run" position. If that is the case, a charge line would alleviate that to an extent, maybe not completely though, I'm not sure. I can understand the importance of making sure your battery was fully charged due to the amount of juice the Jeep would take with all of the systems engaged even if the car is not running. A locked up steering wheel is not good.

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post #104 of 108 (permalink) Old 08-03-2016, 09:23 PM
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So the question is this: If you install a charge line from the RV back to the Cherokee, is the rest of this necessary if you just place the Cherokee's key in the "Run" position instead of the "ACC" position thereby turning everything on?? Is the power steering activated in the "run" position or does the vehicle have to be completely started and turned on? I'm reading some mixed messages about the whole harness issue. My understanding is that the harness is meant to save you from excessive battery drain because the vehicle has to be in the "Run" position. If that is the case, a charge line would alleviate that to an extent, maybe not completely though, I'm not sure. I can understand the importance of making sure your battery was fully charged due to the amount of juice the Jeep would take with all of the systems engaged even if the car is not running. A locked up steering wheel is not good.
The EPS (Electric Power Steering) is not powered up unless the engine is running. Put your Cherokee in Run without the engine running and try turning the steering wheel. It'll be obvious the EPS is not energized.

There are no questions about what the harness does. We have the install instructions. It's clear what its two purposes are.

The harness has nothing to do with saving you from excessive battery drain.

The Cherokee should NOT be in Run when being towed and the steering wheel does NOT lock in North American Cherokees. The engine should NOT be running when being towed. There is nowhere FCA says to tow the vehicle with the engine running or having the ignition in Run. And since that is a fact, anyone that tries it risks the unknown.

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post #105 of 108 (permalink) Old 10-07-2016, 07:19 PM
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Hi Lee, Where did you download the install instructions for the wiring harness. I am picking mine up tomorrow and am not sure instructions will be included, Thanks Steve
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post #106 of 108 (permalink) Old 10-08-2016, 12:31 AM
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Hi Lee, Where did you download the install instructions for the wiring harness. I am picking mine up tomorrow and am not sure instructions will be included, Thanks Steve
Here are the instructions in a pdf that downloads: http://jeepcherokeeclub.com/attachme...6&d=1472675181 posted by member @klenger on 8/31.

2015 White/Black Limited | 3.2-L V6 | Active Drive II | Tech Grp | Lux Grp | Trailer Tow Grp | SafetyTec | Uconect 8.4AN | 9 Speakers | Tonneau Cover | Born 09-06-14 : (( (( (( (( (( (( (( :
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post #107 of 108 (permalink) Old 01-24-2017, 01:09 PM
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Hello all,

I am about to set my 14 Cherokee Trailhawk up for flat towing and plan to do the auto tow mode engage as detailed by @dpinvidic on this forum.

I've also read the the Cherokee needs a Brake Light Relay such as the Roadmaster brake light relay rm-88400 to prevent the MH brake signal from overriding the turn signal. However, does the Cherokee actually need this since the brake light system shuts off after 5 mins anyway? My thought is that it doesn't need it and if by some chance I drive off before 5 mins has elapsed from hookup, the turn signal will only be over ridden for a short amount of time until the Jeep system shuts off.

If I do in fact need a brake light relay, can anyone advise on just building my own configured in the normally closed position. The Roadmaster kit looks like a SPDT 12 Volt relay with harness and various connectors/fuses. I can get a relay for much cheaper and have all the other supplies in my electrical tool kit: https://www.amazon.com/Auto-Truck-Re...f_rd_i=desktop


Many thanks in advance,
Matt
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post #108 of 108 (permalink) Old 01-25-2017, 02:38 AM
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IMO the turn signal override is a non-issue. How often will the auxiliary brake system be activated while turn signals are on, and for how long?

The brake light system doesn't shut off after 5 minutes.
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