Adding a Functioning 7-Way Trailer Connector to a 1999 Ford F-350 with or without Factory Connector

Updated 02/03/2017 | Published 02/02/2017

Products Featured in This Question

Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty)

(422)

$69.72

Wiring Kit for 2, 4, 6, and 8 Brake Electric Trailer Brake Controllers

(159)

$56.26

Question:

How can I tell if my 1999 F350 SD came with the factory 4 way or 7 way connector? I am trying to buy a replacement 7 way connector as the previous owner mutilated mine, but some replacements say they will only work if the truck came with the factory 4 or 7 way plug. My truck has a 7 way and 6 way plug at the back but the 7 way plug only had 4 wires run to it.

asked by: Colton

Expert Reply:

It sounds like your 1999 Ford F-350 either came with a factory 4-Way or no trailer connector at all. A dealership might be able to tell you what equipment the truck had based on the VIN so that is one thing you can try.

Even if it came with a factory 4-Way you can still install a 7-Way with relative ease. First, follow those 4 wires you mentioned forward under the truck. If they plug into another square/rectangular connector then you can use 7-Way # 118243 which comes with the fuses and relays to make it fully functional.

If those 4-Wires go to lights or anything other than a connector then it is likely the truck did not come with any type of factory connector. Since you already have a 7-Way with the light functions you would just need to hardwire the remaining functions using an installation kit # 5506. I have included some links that will help with this installation. Not all of the parts of those links will be relevant so just follow the parts that are.

expert reply by: Michael H