The wiring harness on a snow plow provides control and power to the components of the plow. The harness links the plow components to the controller located in the cab of the vehicle. The harness links the plow components to the vehicle's electrical system.
The wiring harness allows the vehicle's electrical system to power the snow plow headlights. Operators use the snow plow headlights in place of the vehicle headlights. The mechanisms that raise, lower and turn the plow blade use power obtained from the vehicle's electrical system. The wiring harness connects the two. The operator controls the plow using the handheld remote, which is connected to the plow via the wiring harness.