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Provides schematics, diagrams, and charts for multiple vehicle and plow headlamp configurations, using a headlamp index and harness part numbers to quickly locate the correct wiring schematic. Includes lamp type, wire color, connector identification, component-purpose schematics, and special notes for troubleshooting, while also covering hydraulic system circuitry to present the complete electrical system.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":30,"@type":76,"position":81},"https://docshare.wps.com/document/technology/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/electrical-schematics-guide-including-3-and-4-port-isolation-modules-with-2-and-3-plug-systems-and-relay-systems/655157/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/electrical-schematics-guide-including-3-and-4-port-isolation-modules-with-2-and-3-plug-systems-and-relay-systems/655157.png","ImageObject",300,407,{"name":92,"@type":93},"4398046744996","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-01","2026-10-25",true,{"@type":102,"interactionType":103,"userInteractionCount":34},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What is the main purpose of this guide for snowplow electrical systems?","Question",{"text":112,"@type":113},"It serves as a comprehensive diagnostic and repair reference for WESTERN snowplow electrical systems, providing schematics, diagrams, and charts to support troubleshooting of vehicle and plow headlamp setups.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How can the correct electrical schematic be located using the book?",{"text":117,"@type":113},"Use the Headlamp Index to find the electrical schematic for the vehicle; headlamp harnesses are tagged with the harness part number, which guides you to the relevant diagram.",{"name":119,"@type":110,"acceptedAnswer":120},"What additional system information is included beyond headlamp diagnostics?",{"text":121,"@type":113},"While focused on headlamp systems, it also includes hydraulic system circuitry so the complete electrical system is covered during troubleshooting and repair.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},655157,1793029876,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":66,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":133,"file_id":134,"file_url":135,"file_type":136,"file_size":137,"view_count":34,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":11,"language":138,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":139,"faqs":140,"seo_title":141,"seo_description":67,"update_tm":142,"read_time":143},4398046744996,"SNOWPLOWS  \nNovember 1, 2008 Lit. No. 22373, Rev. 07  \nELECTRICAL SCHEMATICS GUIDE  \nIncluding  \n3-and 4-Port Isolation Modules with 2-and 3-Plug Systems and Relay Systems  \nTABLE OF CONTENTS  \nPreface .............................................................................................................. 4  \nLamp Types and Harness Connectors.............................................................. 5  \nElectrical Connectors – 3-Plug Systems........................................................... 6  \nElectrical Connectors – 2-Plug Systems........................................................... 7  \nIn-Line Adapter Instructions – 28027-2 ............................................................. 8  \nVehicle Harness with Relay – 29861................................................................. 9  \n3-Port Isolation Module Systems ................................................................ 10  \nHeadlamp Index .............................................................................................. 10  \nTheory of Operation – Overview ..................................................................... 11  \nTheory of Operation – White Label Non-DRL Module.................................... 12  \nTheory of Operation – Green Label DRL Module ........................................... 13  \nTheory of Operation – Blue Label DRL Module.............................................. 14  \nElectrical Schematic – 3-Plug Straight Blade Snowplows (11-Pin) ................. 15  \nElectrical Schematic – 3-Plug MVP® Snowplows ........................................... 16  \nElectrical Schematic – 3-Plug Straight Blade Snowplows with Central Hydraulics ............................................................................. 17  \nElectrical Schematic – 2-Plug MVP PLUS™ Snowplows (11-Pin) .................. 18  \nElectrical Schematic – 2-Plug WIDE-OUT™ Snowplows (11-Pin) .................. 19  \nHeadlamp Wiring............................................................................................. 20  \n4-Port Isolation Module Systems................................................................ 28  \nHeadlamp Index .............................................................................................. 28  \nTheory of Operation – Overview ..................................................................... 29  \n4-Port Isolation Module System ...................................................................... 30  \n4-Port Isolation Module System – Adapter Kits .............................................. 31  \nConfiguration Plug Instructions – 26421 ......................................................... 32  \nElectrical Schematic – 3-Plug Straight Blade Snowplows (3-Pin) .................. 33  \nElectrical Schematic – 3-Plug MVP Snowplows (7-Pin) ................................. 34  \nElectrical Schematic – 2-Plug MVP PLUS Snowplows (11-Pin)...................... 35  \nElectrical Schematic – 2-Plug WIDE-OUT Snowplows (11-Pin) .....................36  \nHeadlamp Wiring............................................................................................. 37  \nRelay System ................................................................................................. 47  \nRelay System – Headlamp Index .................................................................... 47 3  \nRelay System – Electrical Connectors ............................................................ 49  \n7-Pin Harness.................................................................................................. 50  \nElectrical Schematic – 9-Pin Vehicle Harness – Revision 10 and Later.........53  \nElectrical Schematic – 9-Pin Vehicle Harness – Revision 1–9 .......................54  \n9-Pin Harness ................................................................................................. 55  \nElectrical Schematic – 12-Pin Vehicle Harness – Revision 8 and Later ......... 71  \nElectrical Schematic – 12-Pin Vehicle Harn","cbCaipmwj9kA0wsX","https://ap.wps.com/l/cbCaipmwj9kA0wsX","pdf",5288779,"English","# Preface\n## Introduction\n## How to Use This Book\n# Lamp Types and Harness Connectors\n# Electrical Connectors - 3-Plug Systems\n# Electrical Connectors - 2-Plug Systems\n# In-Line Adapter Instructions\n# Vehicle Harness with Relay\n# 3-Port Isolation Module Systems\n## Theory of Operation - Overview\n## Electrical Schematics (3-Plug Variants)\n# 4-Port Isolation Module Systems\n## Theory of Operation - Overview\n## Electrical Schematics (4-Port Variants)\n# Relay System\n## Wiring and Harness Schematics\n# Electrical Legend and Wire Colors","[{\"question\":\"What is the main purpose of this guide for snowplow electrical systems?\",\"answer\":\"It serves as a comprehensive diagnostic and repair reference for WESTERN snowplow electrical systems, providing schematics, diagrams, and charts to support troubleshooting of vehicle and plow headlamp setups.\"},{\"question\":\"How can the correct electrical schematic be located using the book?\",\"answer\":\"Use the Headlamp Index to find the electrical schematic for the vehicle; headlamp harnesses are tagged with the harness part number, which guides you to the relevant diagram.\"},{\"question\":\"What additional system information is included beyond headlamp diagnostics?\",\"answer\":\"While focused on headlamp systems, it also includes hydraulic system circuitry so the complete electrical system is covered during troubleshooting and repair.\"}]","Electrical Schematics Guide - Including 3-and 4-Port Isolation Modules with 2-and 3-Plug Systems and Relay Systems | PDF",1792959923,227]