Installing Trailer Brake Controller Jeep Liberty
Vehicles equipped with an optional factory-installed trailer towing package have a rear body wire harness that includes a trailer tow wiring take out (2) secured beneath the rear underbody with retainer clips (1 and 3). A molded connector (4) at the end of the take out is connected to a heavy duty, sealed.
*Does not include orders shipped to AK, HI, & PR
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Compatibility Guide | |
| 2005-2019 | Grand Cherokee |
| 2006-2010 | Commander |
If you need a reliable product to supply power from your Jeep to a trailer's electric brakes, then you need the Electric Trailer Brake Controller Harness available from JustforJeeps.com. Mopar designed the Electric Trailer Brake Controller Harness (Item No. 82210512AC) to be easy to connect to your existing trailer wiring harness. The Electric Trailer Brake Controller Harness is designed to promote top-of-the-line safety. It's compatible with all Jeep Grand Cherokees from 2005 to 2018 and Jeep Commanders issued between 2006 and 2010.
Mopar Item # 82210512AC
REVIEWS
The wiring between the two blue plugs was backwards (positive and negative power swapped, brake sense and trailer output swapped). This was installed on a Grand Cherokee without a preexisting harness, therefore both vehicle side wiring hardness and brake controller side harness were installed. This may be different if you're installing just the brake controller and have the factory installed vehicle side harness.
I would recommend swapping the connector pins either on the vehicle side wiring harness or on the brake controller harness. This is easily accomplished with a micro-sized flathead screwdriver. In my case this involved swapping pins 1 and 4, and swapping pins 2 and 3. I would not recommend re-purposing wires since each pin has a specific wire gauge size based on application. From memory, I believe the power wires are the same gauge, but brake sense and trailer output are different gauges.
Note: You may have to rearrange the terminals in the pigtail connector that goes to your controller unit. Mine was completely opposite. Just pull the white tab out slightly on the side of the clip and use a small screwdriver to push the retention tab in holding the individual terminal in the clip and pull it out of the back of the connector. Then reinsert in the right place.
I'm glad that Just for Jeeps sells this part.
RELATED ITEMS
'Standard' Wire colors to the controller (Tekonsha and others):
- Tekonsha and others
- Function
- Black
- Battery Positive to controller
- White
- Negative Ground for Controller
- Blue
- Brake feed from controller to Trailer plug at back of truck
- Red
- tap into truck Brake light switch signal to tell controller to apply brakes
Remember, the above colors are just a GUIDE. your colors may be different, read the instructions!
Under the dash, we tapped into brake light switch. We found the white wire with Green tracer came on when we pressed the brake pedal. Also, with a simple twist of the brake switch, it comes loose from the mount and will drop down, making it much easier to reach!
We found a easy spot on the firewall and grounded the ground wire under the dash with a sheet metal screw.
The picture above, shows the wire connected
We tapped into the WHITE wire with the Green tracer for the brake light signal (to the red wire on the controller) Test to be sure, it must power on when the brake pedal is pushed. Your color may be different!
Battery feed was taken from the battery (under the hood)
The Ground wire (white) was grounded under the dash
the picture above shows the brake switch removed and hanging
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We used red jacketed 2 conductor wire for the brake wire and power feed. One wire feeds power to the controller, and to the back of the truck. The yellow block wire connector is a HD 'Scotch Lock' side tap connector. One wire (white wire in this picture) is the brake power from the controller to the back of the truck.
The picture above shows the rubber grommet hole in the firewall we used to pass the wire through.
Under the hood, we installed a 20 amp Circuit Breaker, to power the controller (running the power into the cabin, though the firewall grommet), and to the rear of the truck to power the T One' Tail light converter. This same power wire was also ran to the 7 way trailer plug we installed as a 12 Volt AUX terminal.
Championship manager 03/04 patch 4.1.5. At the rear of the Truck, In this install, we used the standard 'T ONE connector' to power the lights. This type of trailer light converter requires power from the battery, so we used the same power wire (as shown above that powers the brake controller) to power the converter.
The instructions that come with the converter are pretty easy to understand, and hooking up the tail light wires was very simple. Using a 10mm socket, we took out both tail lights, plugged in the converter to each side, and hooked the power to the converter. Done! All wires passed down under the truck and were run outside, so you do not even pull any panels out of the inside!