etrailer | Trailer Wiring Harness Installation - 1999 Ford Click to view2:47Today 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.Author: etrailerViews: 29K Wiring Harness for 1999 Ford F-250 and F-350 Super Duty Wiring Harness for 1999 Ford F-250 and F-350 Super Duty. Question: under vehicle connector has not been damaged you could use the Ford Replacement OEM Tow Package Wiring Harness, 7-Way (Super Duty), The wiring diagram on our wiring page shows which circuits to 1999 Ford F-250 and F-350 Super Duty Trailer Wiring Fastest shipping available and a lowest price 1999 Ford F-250 and F-350 Super Duty trailer wiring guarantee. Expert lifetime technical support on all purchases. Complete 1999 Ford F-250 and F-350 Super Duty Trailer Wiring installation instructions and customer reviews. Call 800-298-8924 to place your order or order online at etrailer.