7-Way Trailer Wiring Harness Recommendation for 1999 Ford F-250

Updated 10/21/2025 | Published 01/11/2018

Question:

My plug into the trucks trailer harness is broken. I need to get trailer lights and electrical hook ups but it needs to plug into the harness that comes from the front of the truck that is located at the rear. It is the special Ford male plug in. I would like the trailer hook ups to have the 4 wire plus others if possible. The first picture is the picture of what it needs to be plugged into. I need the male plug that will turn into a trailer plug. I need the plug with the hand in it.

asked by: Tom T

Expert Reply:

Based on the picture you send in the correct 7-way trailer wiring harness you are looking for is the part # 118243 which matches the connector and is a confirmed fit for your 1999 Ford F-250.

I attached an install video for this harness below for you to check out as well.

expert reply by: Jameson C

click to enlarge

Ernie B.

10/21/2025

Regarding that 99 f250, how to you pull apart that factory plug under the dash so you can install the male end of the harness in the picture. I bought one from you

Jameson C.

10/21/2025

@ErnieB Old connectors can be sometimes pretty hard to get apart. You have to firms press down on the release tab and as you attempt to pull the connectors apart try and wiggle it as much as possible to get the pins to release. Due to age there's probably some corrosion built up in there that's making it more difficult.