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Trailer Wiring Harness Installation - 1999 Ford F-250

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How to Install a Traielr Wiring Harness on a 1999 Ford F-250

Today on our 1999 Ford F250, we will install the tow ready custom fit wiring harness, part number 118243. Before we can install the new pole and harness, we will need to remove the old and the manufacture. Theres a bolt here securing the bracket, we will remove first and then we will cut the zip tie and remove the wire connector, pressing on the locking tab and remove it from the manufactures wiring. Now we are ready to go ahead and install the new bracket hardware. Before we begin installing the wiring harness, we will need to install the bracket, one to attach to the hitch, and another to attach to the seven pole. The seven pole mounting bracket by Pollak, part number PK12711U will attach to the Draw-Tite no drill mounting bracket, part number 18136.

Now with our brackets connected we can go ahead and fit it to the hitch. As you can see, we will need to go ahead and make some modifications so the bracket will fit flush on the hitch once we secure it, to do this Im going to go ahead and take a paint stick, make a mark on the bracket, and then take it over to a vise and bend it accordingly. Now with our bracket bent we will go ahead and test fit it, and keep making adjustments as necessary. Now with our modifications made we will go ahead and take the clamp and secure it to the hitch. Now we will take the new wiring harness run it through the mounting bracket and secure it to our new seven pole connector.

Once we have the lock in place with pressing the lock and tab, and then we will go ahead and mount the seven pole onto the bracket using the new Pollak hardware, part number PK11926. Now with our seven pole mounted to our seven pole bracket, we will go ahead and route the wire over the hitch and to the connector, we will remove our four pole from earlier. Next we will go ahead and take a zip tie, secure the remaining wire to the hitch, and this will complete the install of the new tow ready custom fit wiring seven pole connector, part number 118243, on our 1999 Ford F250.

Questions and Comments about this Video

What about the fuses and relays
Etrailer Expert
Reply from Jon G.

Steps 3 and 4 in the installation instructions (linked on the product page) talk about referencing your owner's manual and placing the fuses in the "Trailer Tow Electric Brake and Trailer Tow Battery Charge" locations and then the relays in the "Trailer Tow Backup Lamp Relay and the Trailer Tow Battery Charge Relay locations".

Info for this part was:

Employee Zack K
Video Edited:
Zack K
Employee Jeff D
Installed by:
Jeff D
Employee Joshua S
Video by:
Joshua S
Employee Nicholas E
Test Fit:
Nicholas E

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