5th Wheel Wiring Harness Chevy. You will need the Draw-Tite Fifth Wheel and Gooseneck Wiring Harness 20110. Yes the Draw-Tite Fifth Wheel and Gooseneck Wiring Harness item 20110 will install inline with the tow package wiring harness on your truck and the back of the factory connector at the rear bumper on your 2003 Chevrolet Silverado 2500 HD with towing package.
Item 5 GM OEM Horn. GM 15306302 - 1997-2004 C5 Corvette Pigtail Wiring Harness Horn Connector GM 15306302 2500. These wiring harnesses are designed to put an extra connector socket in the bed of your pickup truck while still retaining power to the rear connector socket mounted on your bumper.
You can plug into your existing 7-way truck trailer wiring harness or branch off to retain use of both sockets.
The harness you need is the Hopkins Endurance 5th WheelGooseneck 90-Degree Wiring Harness HM54FR. The ample 10 ft harness routes easily to the truck bed from beneath the vehicle. The reinforced 90 degree angle connector provides convenient installation plugging directly into the OEM wiring system and retaining operational function at the rear of the vehicle. And above gross trailer weight Conventional hitch weight-distributing hitch fifth-wheel hitch or gooseneck hitch Towing a trailer involves all major vehicle systems of your Chevrolet vehicle.