Mopar RV Flat Towing Harness with Mopar Trailer Towing Harness

[Eyeball]

My 2023 JLU was outfitted with a trailer towing package from the factory. I am now considering adding a Mopar RV Towing Harness to the mix. I have looked at others but have decided to use the Mopar to avoid hacking a brand new harness or using diodes.

For those that have done the same are there any tips, tricks, or gotchas when it comes to making them work together? Do they daisy chain together into the tail light connectors or does the trailer harness connect somewhere else?

Thanks for an input.

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[RubiBlueJLU]

I went with the Curt Brand custom tail light wiring kit on my 21 JLURD with LED light package. $75 price range. No splicing required.
Flat 4-pin connecter up front, wires run full length to tail lights. Plug and play at the tail lights. 7 to 4 adapter.
Now, if you have the LED light package, read on.
You WILL have dead battery if you tow for long trips and/or at night. There are MANY threads on this.
The LED tail lights “wake” the Jeep up and kill the battery.
There are several fixes. Add a charge line for the battery, splice into the factory wiring, or disconnect the “sensor” wire at the tail lights.
CoolTech makes a switch that splices into the wires near the drivers seat.
I did the tail light wire disconnect (unplug and back out the connector).

 

[Eyeball]

I went with the Curt Brand custom tail light wiring kit on my 21 JLURD with LED light package. $75 price range. No splicing required.
Flat 4-pin connecter up front, wires run full length to tail lights. Plug and play at the tail lights. 7 to 4 adapter.
Now, if you have the LED light package, read on.
You WILL have dead battery if you tow for long trips and/or at night. There are MANY threads on this.
The LED tail lights “wake” the Jeep up and kill the battery.
There are several fixes. Add a charge line for the battery, splice into the factory wiring, or disconnect the “sensor” wire at the tail lights.
CoolTech makes a switch that splices into the wires near the drivers seat.
I did the tail light wire disconnect (unplug and back out the connector).

Thanks for the info but I have decided against a harness like the Curt that uses diodes or the Cooltech that requires hacking the harness.

 

[RubiBlueJLU]

Here is a LONG thread on the issue. Every harness has this issue, even the Mopar one, if I remember correctly.
I have run with the sensor wire disconnected for over a year and a half.
See post number 212
https://www.jlwranglerforums.com/fo...ery-flatlining-when-flat-towing.15523/page-11

 

[Eyeball]

I have a 12 volt charge line running to the connector on the back of my RV. The Mopar harness will use that to activate the relays in the harness. Pulling off that for a battery charge wire is incredibly simple. Dead battery issue solved…

 

[BAKNBLK]

Back to the top... So the Jeep flat tow harness will provide power to keep the jeep from discharging ? Is it just powering the lights or is it charging the batteries?

Second question part # for a diesel..JL..I'll cut and splice longer for my JT.

Thanks.

 

[Yogi1956]

My 2023 JLU was outfitted with a trailer towing package from the factory. I am now considering adding a Mopar RV Towing Harness to the mix. I have looked at others but have decided to use the Mopar to avoid hacking a brand new harness or using diodes.

For those that have done the same are there any tips, tricks, or gotchas when it comes to making them work together? Do they daisy chain together into the tail light connectors or does the trailer harness connect somewhere else?

Thanks for an input.

Curious what braking system you’re using? Towing our 24’ 4Xe so I carried over the RVi3 portable from our 21’ and had the brake module firmware updated for active braking through RVi3 at no charge. I didn’t want to splice into the 4Xe braking. We added the wireless breakaway and RVi3 battery charge module and the TowMate wireless RF LED light bar. Using the Maximus-3 tow loops (3rd Jeep) so no base plate.

TMI but another way to go.

 

[Eyeball]

Curious what braking system you’re using? Towing our 24’ 4Xe so I carried over the RVi3 portable from our 21’ and had the brake module firmware updated for active braking through RVi3 at no charge. I didn’t want to splice into the 4Xe braking. We added the wireless breakaway and RVi3 battery charge module and the TowMate wireless RF LED light bar. Using the Maximus-3 tow loops (3rd Jeep) so no base plate.

TMI but another way to go.

I went with the Cool Tech harness, Roadmaster brake switch, a RVI charger and a Demco Stay in Play Duo braking unit.

I have used a Stay in Play in my TJ with out any issues for over a decade. That reliability and ease of use that comes with a permanent mounted unit made the choice easy.

 

[Mrjimmystewart]

I used the cool tech. no big deal splicing wires. Totally reliable. I really liked the functionality. i thought I was a bonus not running wires all the way to the back. Less chance of getting snagged on something. Very nice and convenient 6 pin socket mounted in front.

 

[BAKNBLK]

Hello???


Back to the top... So the Jeep flat tow harness will provide power to keep the jeep from discharging ? Is it just powering the lights or is it charging the batteries?

Second question part # for a diesel..JL..I'll cut and splice longer for my JT.

Thanks.

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