Run the wire harness from the Headache Rack between the cab and the body.
On the back of the truck, unplug the 7-Way Plug.
Insert the 7-Way Plug from the modular wire harness, to the back of the truck.
Reattach the existing 7-Way Plug into the second port of the modular wire harness.
Run wire harness from back to front using zip-ties to secure it to the frame of the truck body. (Secure where the harness won’t get rubbed, chaffed, or cut.)
Attach the modular wire harness to the Headache Rack wire harness. Wrap the connection with electrical tape to secure connection.
Wrap excess harness and zip-tie to a secure, hidden, spot.
Check the lights to make sure they work properly.
For a video showing how to install your wire harness, please visit our video gallery.