Content Inside :
The trained mechanic with a comprehensive reference to assist in diagnosis and repair of WESTERN® snowplow electrical systems. It contains schematics, diagrams and charts which supply information for the various types of vehicle and plow headlamp systems. Although intended primarily as a diagnostic tool for headlamp systems, the hydraulic system circuitry is also included to show the complete electrical system. EARLY REVISION VEHICLE HARNESSES (RELAY SYSTEM) All 9- and 12-pin vehicle harnesses are labeled with a white tag indicating the harness part number and revision level. Early 9-pin harness revisions 1-9 and 12-pin harness revisions 1-7 have a ground circuit in which the control, motor relay, and headlamp relays all ground through the 9- or 12-pin connector. Some of these early revision harnesses also have a diode in the ground wire to the headlamp relays. Complete 9- and 12-pin system schematics showing this early revision ground configuration are included in the relay section of the book. These schematics are for early revision harnesses using only the solenoid control. CONFIGURATION PLUG INSTRUCTIONS : NOTE: If unsure of headlamp common, configure plug for a negative common. Complete the installation and check headlamp functions. Turn on the vehicle lights in the low beam mode. Both low beams should be on. If the left low beam does not illuminate, change plug configuration to positive common and test headlamp functions. LAMP TYPES AND HARNESS CONNECTORS : The lamp type is usually embossed in the headlamp lens. Blue ground wires may be LT or DK BLU, w/ or w/o WHT stripe, depending on harness. ELECTRICAL SCHEMATIC – ISOLATION MODULE – STRAIGHT BLADE PLOWS. ISOLATION MODULE SYSTEM. This adapter is required for vehicles equipped with a 4-headlamp lighting system that illuminates the low and high beams when in highbeam mode. This adapter prevents the low beams on the snowplow from illuminating when placed in high beam. ELECTRICAL SCHEMATIC – 9-PIN VEHICLE HARNESS – REVISION 10 AND LATER.
Tags : low beams, high beams, pin harness, straight blade, plug configuration, system schematics, lamp types, schematics diagrams, pin system, beam mode, relay systems, lighting system, control configuration, ground wires, low beam
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