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Trailer Wiring Harness Installation - 2011 Ford Edge

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How to Install a Trailer Wiring Harness on a 2011 Ford Edge

Today on our 2011 Ford Edge, we'll be installing the Curt T-Connector wiring harness with 4-Pole connector, part number C56120. To begin install, we'll first start by opening up the rear cargo door. Then we can remove the spare tire cover. We'll set it aside for re-install later. Next, we'll need to remove the rear threshold. To remove the rear threshold, we'll simply get underneath the threshold and gently pry up and release the fasteners underneath. Once you release the fasteners underneath, we'll go ahead and set the threshold aside. Next, we'll remove the two cargo trays, one on each side of the spare tire. With the cargo trays out of the way, we're going to move behind the taillight assemblies. We'll need to remove the taillight assemblies, and to do this, we'll remove the two fasteners that secure each one, and then gently pop the taillight assembly out of its position, being careful not to break the alignment tabs underneath.

Next, we'll press on the wire connector lock that goes into the taillight assembly, and remove the manufacturers wiring from the taillight assembly. We'll set the taillight assembly aside for re-install later. We'll go ahead and repeat the same process on the passenger side. Now, with both taillight assemblies removed, we'll remove the grommet that secures the manufacturer's wiring behind the taillight assembly. With the grommet removed, we'll go ahead and use a pair of side cutters to cut a slit into the grommet. Now, go ahead and set that aside and take our Curt wiring harness, with the yellow, brown, red wire connector and feed it up behind the drivers side taillight assembly, pulling the wire through the grommet hole.

With the grommet pulled out of the way, we can now take the yellow, red and brown wire connector from our Curt wiring harness and feed up behind the drivers side taillight assembly, and out through the grommet hole. Next we'll go ahead and feed the wire into the grommet and then reinstall the grommet into the grommet hole. We'll go ahead and install the wiring into the slit we cut into the grommet and then reinstall the grommet. Now, take a zip tie and secure the extra wire behind the taillight assembly. Once we secure the wire, we'll cut off the excess zip tie and then reinstall the wiring connector back into the taillight assembly, reassembling the taillight assembly. Next, we'll take the green wire connector from our harness and route it over to the passenger, repeating the same process of routing it up behind the passenger side taillight assembly. Now, with both taillight assemblies reinstalled, we'll go ahead and secure the green wire as we follow it back over to the drivers side. Next, we'll take the white wire with the pre-attached ring terminal that comes from the converter box of our harness, and secure it to the vehicle, as it will be the ground for our converter box and 4-Pole connector.

We'll use the self-tapping screw to secure the ring terminal. Note, recommend to find a location where the sheet metal doubles up. Here, below the taillight assembly, is a perfect location. Once we secure the ground, we're now ready to start connecting the black power wire to the extra length of black wire provided with the install kit. This black wire will ultimately get run up to the front of the vehicle and a make connection with the battery. And it will provide the power for our new 4-Pole connector. First, we'll go ahead and route it behind the rear seat bracket and drivers side inner quarter panel, and then back to the converter box.

We'll then strip the wire, now go ahead and take the extra length of black wire that we just routed, strip it back and add it to the yellow bud connector. Now with our connection point secure, we'll go ahead and wrap it up with some black electrical tape to help keep it free of dirt, dust, debris and moisture. Next, we're ready to mount the converter box. To mount the converter box, we use a two-sided adhesive provided with the install kit. We'll peel back one side of the adhesive and adhere it to the converter box, and the other side, and adhere it to the clean, flat surface, preferably sheet metal, which we can find below the taillight assembly on the drivers side underneath the quarter panel. With the converter box secured, we'll go ahead and cut off any excess from the zip ties to clean up our install look, and we can reinstall all the interior trim components. With our converter box secured, we'll go back to our power wire, as we'll need to route it outside the vehicle so we can run it up to the engine compartment. To do this, we're going to go through the manufacturers grommet. Using a utility knife, we'll cut a small slice in the grommet, and then feed our wire through it. Once we have all the wire pulled through, we'll go ahead and secure the wiring to the manufacturers harness, and then we'll cut off the excess from our zip ties to clean up our install look. Now we can go ahead and reinstall the interior trim components. Next, we'll get underneath and start routing our power wire up to the engine compartment. Keep in mind when routing the wire, stay away from any moving components, such as standard suspension or excessive heat, such as exhaust. Keep in mind as we route the wire, we'll also secure it with black zip ties, as necessary. Now that we've got the power wire run up to the bottom of the engine bay, we need to route through the engine bay and up to the top of the engine. To do this, we use a pull wire. That can be a stiff piece of wire or in this case, we're going to use a piece of air tubing. Feed it up through the engine compartment, and then we can secure our power wire to the pull wire, then pull it to the top of the engine bay. Once we have it to the top of the engine bay, we'll go ahead and secure the wire with a zip tie, then cut off any excess from the power wire. Next, we'll go ahead and prepare our fuse holder. The fuse holder provided with the install kit will get a ring terminal on one side and a bud connector on the other. Then we'll take that bud connector and attach it to the power wire we just ran to the engine bay. Once again, once we use the bud connector to make connection points, we'll go ahead and wrap it up with black electrical tape. Next, we'll go ahead and remove the positive battery post cover, and then remove one of the nuts on the positive battery terminal. Once we remove the nut, we can install the ring terminal and then re-secure the nut. Now, we'll go ahead and install a fuse in the fuse holder, then secure the fuse holder to the manufacturers wiring using one of the zip ties provided with our install kit. With all the wiring secured, and our install complete, we'll go ahead and cut off the excess from the zip ties and clean up our install look. Next, we'll show you the operation of your new 4-Pole connector. Simply take the 4-Pole connector, underneath the spare tire cover in the rear storage compartment, and route it towards the center of the vehicle and down to the hitch or accessory. Keep in mind, you need to stay away from the latch on the rear cargo door, as pinching off in the latch can harm the wire. However, the weather stripping is thick enough that it won't, and we can completely close the rear cargo door on it. Then once we're finishing using our new 4-Pole connector, we'll simply wrap it up and put it back in the rear cargo area. Next, we'll go ahead and show you how to test the new 4-Pole connector. Using a test light, put our ground clamp on the white wire or bare terminal. Then, testing the brown wire terminal will be our running light circuit, yellow wire terminal will be the left turn signal, left brake, and green wire terminal will be the right turn signal, right braking. That does it for the install of the Curt T-Connector vehicle wiring harness with 4-Pole connector, part number C56120, on our 2011 Ford Edge. .

Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Nicholas E
Test Fit:
Nicholas E
Employee Andrew K
Video by:
Andrew K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Cole B
Installed by:
Cole B

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