{"product_id":"royal-enfield-main-wiring-harness-thunderbird-350-bs3-594440-f","title":"Main Wiring Harness (Harness-Main Cable) – Thunderbird 350 BS3 (TCI) – 594440\/F (Replaces 594440\/A, \/B, \/C, \/D, \/E)","description":"\u003cp\u003e\u003cstrong\u003eRoyal Enfield 594440\/F\u003c\/strong\u003e is the \u003cstrong\u003eMain Wiring Harness\u003c\/strong\u003e (also listed as \u003cstrong\u003eHARNESS-MAIN CABLE\u003c\/strong\u003e) used on specific \u003cstrong\u003eThunderbird 350\u003c\/strong\u003e variants. It is the bike’s primary electrical loom that routes power and signals between key components like ignition\/kill circuits, lighting, indicators, switches, relays, sensors, and charging system wiring.\u003c\/p\u003e\n\u003cp\u003eIf you’re facing recurring electrical problems—intermittent headlamp\/taillamp, random fuse blowing, starting\/ignition cut, melted insulation, or accident-repaired “wire-jugaad”—a fresh OEM harness is the most reliable reset because internal breaks and corroded terminals are hard to diagnose and often return.\u003c\/p\u003e\n\u003cp\u003eThis listing also captures supersession: multiple older 594440\/* harness references are shown as \u003cstrong\u003ereplaced by 594440\/F\u003c\/strong\u003e, so you’re ordering the latest supply reference.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAlso searched as:\u003c\/strong\u003e main wiring harness, wiring loom, complete wiring kit, harness main cable, Thunderbird 350 wiring.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBefore you buy:\u003c\/strong\u003e confirm your bike is \u003cstrong\u003eThunderbird 350 BS3\/TCI\u003c\/strong\u003e and match the \u003cstrong\u003econnector shapes + pin layout\u003c\/strong\u003e. Share photos of key connectors before dispatch for return-safe shipping.\u003c\/p\u003e\n\u003ch2\u003eKey Features \u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine OEM Royal Enfield part: \u003cstrong\u003e594440\/F\u003c\/strong\u003e (HARNESS-MAIN CABLE)\u003c\/li\u003e\n\u003cli\u003eSupersession capture: replaces \u003cstrong\u003e594440\/A, 594440\/B, 594440\/C, 594440\/D, 594440\/E\u003c\/strong\u003e where applicable\u003c\/li\u003e\n\u003cli\u003eBest fix for harness cuts, brittle insulation, water ingress, and corrosion at terminals\u003c\/li\u003e\n\u003cli\u003eOEM connector housings and routing lengths for factory-style fit\u003c\/li\u003e\n\u003cli\u003eTargets common failure area near headstock bend (intermittent open circuits)\u003c\/li\u003e\n\u003cli\u003eReduces repeat fuse blowing caused by shorts in aged\/modified wiring\u003c\/li\u003e\n\u003cli\u003eIdeal for full electrical restoration on older Thunderbird 350 builds\u003c\/li\u003e\n\u003cli\u003eReturn-prevention support: connector\/photo verification before shipping\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatibility Table \u003c\/h2\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003ePlatform\/Engine\u003c\/th\u003e\n\u003cth\u003eBS\/Emission\u003c\/th\u003e\n\u003cth\u003eYears\u003c\/th\u003e\n\u003cth\u003eStatus (✅\/❓)\u003c\/th\u003e\n\u003cth\u003eNotes\/Constraints\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoyal Enfield Thunderbird 350\u003c\/td\u003e\n\u003ctd\u003eUCE 350 \/ TCI (Thunderbird)\u003c\/td\u003e\n\u003ctd\u003eBS3\u003c\/td\u003e\n\u003ctd\u003e2010–2016\u003c\/td\u003e\n\u003ctd\u003e✅\u003c\/td\u003e\n\u003ctd\u003eConfirmed across multiple seller listings for Thunderbird 350 BS3\/TCI. Match connectors before dispatch. (Supersession: earlier 594440\/* → 594440\/F).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoyal Enfield Thunderbird 350\u003c\/td\u003e\n\u003ctd\u003eUCE 350 (Thunderbird)\u003c\/td\u003e\n\u003ctd\u003eBS4\u003c\/td\u003e\n\u003ctd\u003e2017–2019\u003c\/td\u003e\n\u003ctd\u003e❓\u003c\/td\u003e\n\u003ctd\u003eNot consistently confirmed for BS4 variants in checked sources—verify by VIN\/parts fiche or connector photos.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRoyal Enfield Thunderbird 500\u003c\/td\u003e\n\u003ctd\u003eUCE 500 (Thunderbird)\u003c\/td\u003e\n\u003ctd\u003eBS3\/BS4\u003c\/td\u003e\n\u003ctd\u003evaries\u003c\/td\u003e\n\u003ctd\u003e❓\u003c\/td\u003e\n\u003ctd\u003eDo not assume cross-fit. Confirm by part-number match or connector photos.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClassic 350\/500 \/ Bullet \/ Electra\u003c\/td\u003e\n\u003ctd\u003eUCE\u003c\/td\u003e\n\u003ctd\u003evaries\u003c\/td\u003e\n\u003ctd\u003evaries\u003c\/td\u003e\n\u003ctd\u003e❓\u003c\/td\u003e\n\u003ctd\u003eMain harness differs by platform and switchgear; order only by exact part number match.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClassic 350 Reborn \/ Meteor \/ Hunter \/ Bullet J-Series\u003c\/td\u003e\n\u003ctd\u003eJ-Series 350\u003c\/td\u003e\n\u003ctd\u003eBS6\u003c\/td\u003e\n\u003ctd\u003e2021+\u003c\/td\u003e\n\u003ctd\u003e❓\u003c\/td\u003e\n\u003ctd\u003eNot compatible (different platform\/harness architecture).\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eVariants\u003c\/h2\u003e\n\u003cp\u003eNo variants.\u003c\/p\u003e\n\u003ch2\u003eFAQs \u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eQ1 (Fitment): How do I confirm 594440\/F fits my Thunderbird 350?\u003c\/strong\u003e\u003cbr\u003eMatch: (1) Thunderbird 350, (2) BS3\/TCI is the most consistently confirmed application, and (3) connector housings + pin layout match your old harness. If unsure, share photos before dispatch.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ2 (Fitment): Will this fit Thunderbird 350 BS4?\u003c\/strong\u003e\u003cbr\u003eNot consistently confirmed for BS4 in the checked sources. Treat BS4 as unverified unless you confirm by VIN\/parts fiche or exact connector match.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ3 (Comparison): Why does 594440\/F replace older 594440\/A-B-C-D-E?\u003c\/strong\u003e\u003cbr\u003eCatalogs often supersede older supply references to a newer part number. Ordering the latest superseded number is preferred, but connector verification is still mandatory because variants exist.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ4 (Installation): Any precautions while replacing the main harness?\u003c\/strong\u003e\u003cbr\u003eDisconnect battery first. Route the loom exactly like stock, avoid tight bends at the headstock, re-seat grommets, and secure with correct clips\/ties. Test lights\/charging\/ignition before refitting panels.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ5 (Symptoms): What problems does a new main harness solve?\u003c\/strong\u003e\u003cbr\u003eIntermittent cut-off, random fuse blowing, flickering lights, melted wiring, water-damaged insulation, brittle\/cracked loom, and recurring electrical issues after accident repairs.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eQ6 (Returns-prevention): What must I send before shipping?\u003c\/strong\u003e\u003cbr\u003eSend bike model + year, BS3\/BS4 status, and clear photos of 2–3 key connectors (ignition\/ECU area + handlebar switch connectors). This prevents wrong variant orders.\u003c\/p\u003e","brand":"Royal Enfield (Genuine OEM)","offers":[{"title":"Default Title","offer_id":51057563205927,"sku":"594440\/F","price":2180.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/PARTS_PARTS_105231915-5940381_c277bc5d-f4e6-44e9-abca-06e370359248.jpg?v=1771838884","url":"https:\/\/underthehood.co.in\/products\/royal-enfield-main-wiring-harness-thunderbird-350-bs3-594440-f","provider":"UNDER THE HOOD","version":"1.0","type":"link"}