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12
DIAGNOSTIC METHOD - FIND THE PROBLEM....FAST!
If all functions test correctly but no power is being sent to the 12vdc Hi-Amp (Pin #2), test the Brown Wire at the Pump
Solenoid. To do this, activate each function (Lift, Left, Right) and test the Brown Wire connection at the Solenoid with
the Test Light. If no power is present, the Harness may be faulty.
If power is present but the Solenoid is not operating, double check the Battery Cable connections as well as the
mounting surface. The Pump Solenoid grounds through the Mounting Bracket and must have a rust-free, metallic
surface to mount to. If the above has been checked, the Solenoid is faulty. If the Solenoid is transferring voltage from
one terminal to the other when activated, the Solenoid is working properly and there may be an internal malfunction in
the Harness.
If, after performing the above test procedures, the Vehicle Harness is working properly, remove the A-Frame Cover from
the Plow and plug the Plow Harness into the Vehicle Harness. It is not necessary to re-attach the Plow to the vehicle as
this reduces the work area. It may be necessary, however, to remove the Harness P-Clamp from the Lift Frame Upright
and remove the Wire Ties holding the Headlight pigtails. This will increase the Harness length.
The next step in the testing procedure is to determine if the Plow Side Harness is working properly.
Testing Plow Light System: For lighting problems, test the Plow Light Switch first. Turn the vehicle headlights on.
Locate the Plow Headlight Switch and test each wire for power depending on the position of the Switch. If the Switch
toggles between vehicle and plow lights properly, disconnect the Headlight Adapters one side at a time and test the Gray
Packard Connectors for power. See the diagram below for details. If all of the functions test properly, the Vehicle
Harness is in proper working order. Otherwise, there is an internal malfunction in the Harness.
Testing Plow Functions:
WARNING: DISCONNECT THE POSITIVE BATTERY CABLE FROM THE BATTERY SIDE OF THE PUMP MOTOR
SOLENOID BEFORE TESTING THE PLOW SIDE HARNESS. IF THIS IS NOT DONE, THE PLOW MAY MOVE
ERRATICALLY DURING THIS TEST. FAILURE TO DO SO MAY RESULT IN SERIOUS INJURY OR DEATH.
Related Components: Plow Side Wiring Harness
12vdc Valve Coils
Plow Lights
12vdc Pump Motor
System #2: Plow Electrical System:
(29 paginas)
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