Trailer Brake Controller Installation - 2008 Jeep Liberty

content loading



Customers compare ETBC7 to these similar products




Products Featured in this Video




How to Install a Trailer Brake Controller on a 2008 Jeep Liberty


Today in our 2008 Jeep Liberty, we'll be installing E-trailer's ETBC7 brakecontroller installkit with the Curt venture brake controller part number C51110. To start, we'll first go ahead and assemble the 7 pole adapter bracket. With the hardware provided, we'll use it to attach the bracket to the 7 pole adapter. We'll go ahead and take the bracket, feed over the wires and up to the back of the amounting surface for the 7 pole adapter. Then we'll take the screws, feed them to the front side of the 7 pole and secure it with the knots in the back side. Once we have all four in place, we'll go ahead and tie them down.I'm going to go and take some black electrical tape and wrap up 8 to 10 inches of our wire.

This will assist in bundling our wires together and help protect it from the elements. Next, we'll go ahead and attach the draw-tite no drill mounting bracket part number 18136. Using the fasteners provided with the bracket, we can secure it to the 7 pole bracket. Now that our 7 pole connector and bracket's set up, we're ready to install it on the vehicle. We'll use the clamp provided with the bracket to secure it. Now, with our 7 pole brackets secured to the hitch, next we'll take the flat 4 pole connector that's all ready on the vehicle and connect it to the 4 pole coming out of the back of our new 7 pole connector.

Note, I recommend to use some dielectric grease between the two connection points to help keep down corrosion. We'll be using the Edelman dielectric grease part number 11755. Once we make this connection, we're going to go ahead and wrap it up with some black electric tape to help keep out the dust, dirt and debris. To make this connections, we'll go ahead and strip back the gray sheeting around the black and white wires inside, strip back the wires and then connect the black wire to the black wire from the 7 pole connector and the white wire from the gray duplex cable to the blue wire from the 7 pole connector.Now with our connection points secured, we'll go ahead and wrap them up with some black electrical tape. Next, we can start hooking up our wires.

We'll take the white wire with the preattached ring terminal and run it over to the vehicle's frame. Using the cell tapping screw provided with our install kit, we can secure the ring terminal directly to the frame providing ground for our 7 pole connector and 4 pole connector. Now, to access this wiring, we'll first open up the rear hatch, removethe two screws and secure the tail assembly and then pop it out of position. Being careful not to break the alignment tabs underneath. Then using our test light and putting the vehicle in reverse, we'll go ahead and probe the necessary wire to locate the reverse signal. This application will be the white wire with a light green tracer.

Now, we'll go ahead and pull back on some of the wire loom and get it out of the way so we can use a quick splice connector to secure an extra length of wire directly to the white wire with the light green tracer and then run the extra length of wire down between the bumper cover and body of the vehicle and reinstall the driver's side tail at assembly. Once we have it below, we'll go ahead and cut the length, strip it back and add it to our yellow back connector on the purple wire. Now with all our connections made, we'll go ahead and wrap up our wires with some black electrical tape to help bundle them together and clean up our install look. With that done, we can then go ahead and use some zip ties to secure the wiring as necessary. Next, we're ready to start running our gray duplex cable to the front of the vehicle. Keep in mind, when running a wires, stay away from any moving components to the stirring or suspension or excessive pits such as the exhaust. As we go along, we'll secure the wiring with the black zip ties provided with our install kit. Now, we have reached the front of the vehicle at the bottom of the engine compartment, we'll run our gray duplex cable to the loom clamp that all ready installed in the vehicle. Loosen or remove the loom clamp, run the gray duplex cable through it and then resecure the loom clamp back to the frame of the vehicle. Next, using a pole wire which can be a set piece of wire or in this case, a piece of red air tubing to assist in routing our gray duplex cable to the top of the engine bay. We'll take the pole wire, route it as necessary to the engine bay, then using some black electrical tape can tape our gray duplex cable to the pole wire and then pull it up to the top of the engine compartment. Now, we have our gray duplex cable to the other top of the engine compartment, hold it to the firewall and route it over to the battery. Then we'll go ahead and cut offthe excess gray duplex cable. Next, we'll hold the mark on our gray duplex cable where we'll need to split the gray sheeting. Once we split it, we'll pull the wires out and then cut off the sheeting that we just split. We're splitting it because the white wires is going to run into the vehicle and our black wire will ultimately run to the positive battery terminal through a breaker. Out to run our white wire into the vehicle, we're going to go to the manufacturers grommethere in the firewall. To do that, we'll need to cut a slice in the grommet to run through. We'll go ahead and pull the grommet off thefirewall and then cut a slice into it. Put our white wire to the slice and then route the wire into the cabin of the vehicle. Next, we'll take the leftover gray duplex cable that we cut off from our original piece and route it through the grommet also and reinstall our grommet. Next, we'll move to the cabin of the vehicle. Next, we'll go ahead and remove the installation panel that covers bottom of the dash. We'll remove the two push pin fasteners and secure it. Here, we need to install our brake controller bracket and brake controller. First, we'll take the bracket and secure it here to the dash using the cell tapping screws provided with the brake controller. Then we'll secure the brake controller to the brake controller bracket with the hardware provided. Next, we'll use the Curt universal wiring adapter for brake controllers part number C51515 and plug it in to the pigtail coming out of the brake controller. Then we can take the red wire from the pigtail which will run to the brake switch of the vehicle for our brake switch signal. Now withthat done all the way, we can easily access up underneath the dash. Next, we'll go ahead and locate the brake switch signal using our test light. We'll back pin the connector and press in the pedal to see which wire is hot only when the brake panel is depressed. For this application, we located the white wire with the green tracer. We'll go ahead and remove any electrical tape or sheeting so we can install a quick splice connector. Once we have the quick splice connector in place, we'll then slide the red wire into the quick splice connector. Crimp it down and close it clasped routing our pigtailover to the cake panel. Next, we'll need to take the blue wire from our pigtail and connect it with the white wire we run from the 7 pole into the grommet into the vehicle. We'll cut offthe excess in the white wire, strip it back and add a bulk connector. We can then take the blue wire from our pigtail and secure it to the other side of the bulk connector crimping it down. This will give our power to our trailer braking. The remaining two wires from our pigtail will be a black and white wire. This will be powering ground for the brake controller. To provide power and ground, we'll use the two remaining wires inside the gray duplex cable. We'll go ahead and strip back a couple of inches and cut off the gray sheeting. We'll then strip back the black and white wire, add bulk connectors and then secure it black to black and white to white. Now with all the connections made, we'll go ahead and wrap them up with some black electrical tape and then secure the wiring as necessary under the dash. Now with all the wires secured, we'll go ahead and cut off the excess of the zip ties to clean up our install look. Next, we'll go ahead and reinstall the interior panel. Now with everything secured, we'll move back to the engine compartment. Now, we're back underneath the hood, we need to install the 40 amp breaker provided with the brake controller installed kit using the cell tapping screws provided. Then we'll take the black wire that we ran from our 7 pole connector and secure it to the silver side of the breaker using the small ring terminal provided with our install kit. We'll secure the ring terminal with the serrated washer and knot. Next, we'll go ahead and take the gray duplex cable that we route inside for powering ground for our brake controller and run it over to the negative battery post. Then we'll cut off the excess duplex cable and strip back the necessary sheeting so that we can route the black wire to a second breaker. Next, we'll go ahead and mount the second breaker here to the inner fender well right next to our 40 amp breaker. Now, with the second breaker mounted, we'll go ahead and cut off the excess from the black wire, strip it back and add a small ring terminal. We'll then attach that one to the silver side of the second breaker. Next, we'll take the white wire from the gray duplex cable we just removed, cut off any excess, strip it back and add a large ring terminal. That ring terminal will get attached the negative battery post stud. We'll remove the knot from the stud, install the ring terminal and then re secure the knot. Next, we'll need to make up two leads to go from the copper side of our breakers to the positive battery terminal. Using a leftover black power wire from the gray duplex cable, we'll go ahead and strip back one in adding a small ring terminal and securing it to the breaker, routing it to the positive battery terminal and then repeating the same process for the second wire.Now, with both ring terminals routed to the positive battery post, we'll go ahead and remove the positive battery post stud knot, install both ring terminals and then resecurethe knot. With all our wires now connected, we'll go ahead and secure them as necessary with the black zip ties. We'll go up the excess from the zip ties to clean up our install look and that will complete our install of the E-trailer ETBC7 brake controller install kit part number ETBC7 in conjunction with the Curt venture brake controller part number C51110 on our 2008 Jeep Liberty.


Questions and Comments about this Video

add comment

Info for these parts were:

Test Fit:
Joe V
Test Fit:
Nicholas E
Test Fit:
Randy B
Test Fit:
Brent H
Video by:
Andrew K
Video by:
Joshua S
Video by:
Andrew L
Video by:
Kathleen M
Installed by:
Jeff D
Video Edited:
Joshua S
Video Edited:
Andrew L
Video Edited:
Chris R
Video Edited:
Zach D

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.