Make sure the power is turned on at the plow remote control in the interior of the vehicle.
Unplug and reconnect both the plow control wiring harness and the lighting wiring harness.
Check the fuse in the vehicle control wiring harness, and replace if it is defective.
Check for excess weight on the plow. Remove accumulated snow and ice. Remove any aftermarket accessories, such as lights, that add significantly more weight to the plow.
Check the hydraulic fluid level in the pump reservoir. Add hydraulic fluid, if necessary.
Verify that the 12-volt battery in the vehicle is fully charged. Make sure the vehicle charging system is operating properly.
Check the hydraulic fluid level in the pump reservoir. Add hydraulic fluid, if necessary.
Perform the manufacturer's recommended annual hydraulic bleeding procedure, to remove air from the hydraulic pistons.
Verify that the 12-volt battery in the vehicle is fully charged. Make sure the vehicle charging system is operating properly.
Make sure the manufacturer's recommended hydraulic fluid is installed and that it is the correct grade for the present outside temperature.
Check the fuse in the vehicle control wiring harness, and replace if it is defective.
Tighten hydraulic fittings and hose connections. Look for any damaged components and consult the manufacturer for service.
Determine whether the fluid reservoir is overfilled.
Tighten hydraulic fittings and hose connections. Look for any damaged components and consult the manufacturer for service.
Evaluate the condition of O-rings and seals in the hydraulic system. If replacement is required, consult the manufacturer for service.
Make sure the manufacturer's recommended hydraulic fluid is installed and that it is the correct grade for the present outside temperature.
Verify that the 12-volt battery in the vehicle is fully charged. Make sure the vehicle charging system is operating properly.
Check the vehicle manufacturer's specifications for the vehicle electrical system, to determine if the system is adequate to accommodate the plow.
Disconnect and reconnect the plow/vehicle lighting wiring harness to verify the connection.
Check for burned out bulbs, bulbs loose in sockets or corroded sockets.
Check for a defective fuse in the control harness, if the plow's parking/turn lamps are inoperative.
Check for a burned out headlamp or a defective fuse in the vehicle, if the vehicle headlamps are inoperative.