Looking For Wiring Harness For Factory Harness On 1999 Ford F-350

Updated 05/11/2026 | Published 05/06/2026

Products Featured in This Question

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way Trailer Connector

(169)

$52.94

Curt T-Connector Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Pole Flat Connectors

(761)

$37.30

Question:

I have a 99 F350 XL Xtra cab V10 Dually.. is there any tow connection to plug into the factory harness.. I have 2 plugs coming off the factory harness, thanks ??

asked by: RON M

Expert Reply:

Hello Ron, thanks for reaching out. Yes, there is a harness that hooks up to the factory harness on a 1999 Ford F-350. The thing is this vehicle will have one of two types of connector for this model year. It's either a round plug or a rectangular plug so you'll want to check and verify which one you have.

For the rectangular plug you can use the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55243.

If it's the round plug, use the Curt T-Connector Vehicle Wiring Harness for Factory Tow Package # C55774.

What kind of trailer will you be hauling?

expert reply by: Jesse M

C55243
(click to enlarge)

Ron M.

5/8/2026

I have round and rectangle plugs, the rectangle is currently connected to a 7 pin, I want to use a 7 blade for my 5th wheel.

Jesse M.

5/8/2026

@RonM Oh ok are you wanting to add a 7-way to the bed then? For that you can use the Mighty Cord 5th Wheel/Gooseneck Wiring Harness w/ 7-Way Connector # A10-7010. This will tee into the round plug connector so you can have a 7-way on the bumper and in the bed.