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The manual guides installers to disconnect battery power before removing the original harness, route and terminate universal wires, and retain existing harness components for possible reuse. It includes cautions about heater-only blower wiring, notes about A/C circuit inclusion, explains 900-series printed wire identification, and provides a detailed table of contents for terminals, grounds, fuses, relays, routing, and electrical sections.",{"@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/10112-wire-harness-installation-instructions-19-circuit-classic-customizable-1963-66/654924/",{"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/10112-wire-harness-installation-instructions-19-circuit-classic-customizable-1963-66/654924.png","ImageObject",300,407,{"name":92,"@type":93},"Hazel","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-11-01","2026-10-25",true,{"@type":102,"interactionType":103,"userInteractionCount":29},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What safety step must be completed before removing the original harness and installing the new harness?","Question",{"text":112,"@type":113},"Disconnect vehicle power by removing the negative or positive battery cable from the battery before removal and installation.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"Does harness 10112 include blower wiring for heater-only trucks and any A/C wiring?",{"text":117,"@type":113},"Yes, it includes wiring from the blower switch to the blower motor/resistor for heater-only trucks. It does not include A/C wiring for heater-only trucks, but it does include a circuit to power factory or aftermarket A/C systems.",{"name":119,"@type":110,"acceptedAnswer":120},"How are unused wires handled to prevent failures?",{"text":121,"@type":113},"Unused or unconnected wires must have their ends terminated with an insulated terminal or electrical tape to prevent shorting and harness failure or fire.","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},654924,1793103803,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":29,"category_name":30,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":29,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145},137441390410,"https://ap-avatar.wpscdn.com/avatar/2000252f4ab5702993?_k=1776741390130283984","Wire Harness Installation Instructions  \nFor Installing Harness Numbers:  \n10112: 19 Circuit Classic Customizable 1963-66 GMC / Chevy Pickup Truck Harness  \nPainless Performance Products recommends you, the installer, read this installation manual from front to back before installing this harness.  \nPainless Performance Products, LLC 2501 Ludelle St.  \nFort Worth, TX 76105-1036 PHONE: 800-423-9696 FAX: 817-244-4024  \n[EMAIL:](EMAIL: support@painlessperformance.com)[ ](EMAIL: support@painlessperformance.com)[support@painlessperformance.com](EMAIL: support@painlessperformance.com)  \nIf you have any questions concerning the installation of this harness, feel free to call Painless Performance Products' Tech Line at 1-800-423- 9696. The Tech Line can be reached [from 8 A.M. to 5 P.M. central](from 8 A.M. to 5 P.M. central) time, Monday through Thursday, [and 8 A.M. to 4:30 P.M. on](and 8 A.M. to 4:30 P.M. on) Fridays.  \nWe have attempted to provide you with as accurate of instructions as possible and are always concerned about corrections or improvements that can be made. If you have found any issues or omissions, or simply have comments or suggestions concerning these instructions, please write us atthe above address, send us a fax at (817) 244-4024, or email us at [painless@painlessperformance.com](painless@painlessperformance.com. We)[. We](painless@painlessperformance.com. We) sincerely appreciate your business.  \nPainless Performance Products, LLC shall in no event be liable in contract or tort (including negligence) for special, indirect, incidental, or consequential damages, such as but not limited to, loss of property damage, or any other damages, costs , or expenses which might be claimed as the result of the use or failure of the goods sold hereby, except only the cost of repair or replacement.  \n3rd ed. Sept. 2021  \nCAUTION: BEFORE THE REMOVAL OF YOUR ORIGINAL HARNESS AND/OR THE INSTALL OF YOUR NEW PAINLESS HARNESS, DISCONNECT THE POWER FROM YOUR VEHICLE BY REMOVING THE NEGATIVE OR POSITIVE BATTERY CABLE FROM  \nTHE BATTERY.  \n• A full-color copy of these instructions can be found online at:  \n[http://www.painlessperformance.com/manuals/10112.pdf](http://www.painlessperformance.com/manuals/10112.pdf)  \n• If your vehicle has an existing harness, you will want to retain it for the possible re-use of various pigtails and connector housing particular to your application. During the removal process, avoid making any unnecessary cuts.  \n• Please pay attention to the Pre-Installation section of this manual beginning on page 16. Your new Painless harness may need wires rerouted to suit your installation.  \n• This harness does include wiring from the blower switch to the blower motor/resistor for heater only trucks. It does NOT include any wiring for an A/C. This harness does include a circuit to power factory or aftermarket A/C systems.  \n• This harness is universal in nature. This means most/all ends are left open to allow you to cut each wire to length and install/make the appropriate connection. The small parts package and the bag kits with terminals and connectors included with the harness will enable you to make connections.  \nIf there are unused or unconnected wires, they will need to have their ends terminated with an insulated terminal or electrical tape. Doing so will prevent the wires from shorting and causing harness failure or fire  \n• Only printed wires have a 900-series number. These 900-series numbers are used to identify various wires and circuits in the wiring diagrams that are a part of these instructions.  \nTABLE OF CONTENTS  \nPAGE \\#  SECTION  \n1  INTRODUCTION  \n2  CONTENTS  \n3 SMALL PARTS  \n4 TOOLS NEEDED  \n5 TO REMOVE A TERMINAL  \n6  INSTALLING FACTORY STYLE TERMINALS  \n7  GROUNDS  \n8 WHY ARE CLEAN GROUNDS IMPORTANT?  \n10  FUSE BLOCK  \n10 HORN RELAY  \n10 FLASHERS  \n11 FUSE IDENTIFICATION  \n12 ACCESSORY PORTS  \n13 RELAYS & SWITCHES  \n15  OLD FACTORY HARNESS REMOVAL  \n16  PRE-INSTALLATION GUIDELINES  \n18  FUSE","cbCaipO9OzDG0bBk","https://ap.wps.com/l/cbCaipO9OzDG0bBk","pdf",14200826,118,"English","# Introduction\n# Contents\n# Small Parts\n# Tools Needed\n# To Remove a Terminal\n# Installing Factory Style Terminals\n# Grounds\n# Why Are Clean Grounds Important?\n# Fuse Block\n# Horn Relay\n# Flashers\n# Fuse Identification\n# Accessory Ports\n# Relays & Switches\n# Old Factory Harness Removal\n# Pre-Installation Guidelines\n# Fuse Block Mounting\n# Firewall Plate\n# Harness Routing\n# Headlight Section\n# Tail Section\n# Engine Section\n# Interior\n# Horn\n# Accessory / Fan Relay\n# Left / Driver Side Headlight\n# Right Headlight\n# Turn / Park Light\n# Coolant Temp Sensor\n# Oil Pressure Sensor\n# Electric Choke\n# Start / Charge Section\n# Alternator and Related Sections\n# Starter Solenoid\n# Transmission Switch\n# Coil / Ign. Section\n# Tachometer\n# MIDI Fuse\n# GM Columns\n# Accessories\n# Instrument Panel and Hardwiring\n# Factory Panel Wiring\n# Relay Activation / Accessory Power","[{\"question\":\"What safety step must be completed before removing the original harness and installing the new harness?\",\"answer\":\"Disconnect vehicle power by removing the negative or positive battery cable from the battery before removal and installation.\"},{\"question\":\"Does harness 10112 include blower wiring for heater-only trucks and any A/C wiring?\",\"answer\":\"Yes, it includes wiring from the blower switch to the blower motor/resistor for heater-only trucks. It does not include A/C wiring for heater-only trucks, but it does include a circuit to power factory or aftermarket A/C systems.\"},{\"question\":\"How are unused wires handled to prevent failures?\",\"answer\":\"Unused or unconnected wires must have their ends terminated with an insulated terminal or electrical tape to prevent shorting and harness failure or fire.\"}]","10112 - Wire Harness Installation Instructions - 19 Circuit Classic Customizable 1963-66 | PDF",1792958494,297]