{"product_id":"21-circuit-universal-wiring-harness-kit-extra-long-wire","title":"21 Circuit Universal Wiring Harness Kit - Extra Long Wire","description":"\u003cp\u003eIn this review of the 21 Circuit Universal Wiring Harness Kit the bottom line is simple: this is a practical, budget-friendly universal harness for custom cars and classic restorations that need clearly labeled circuits and broad compatibility. It is aimed at hobbyists and professional builders who want a ready-made wiring backbone compatible with GM, Chevy, Mopar, Ford and many other makes, and the single biggest reason to buy is the combination of 21 circuits with labeled wires every 5 in and 17 fuses, which saves hours of routing and tracing during installation.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUniversal Fitment:\u003c\/strong\u003e The harness is designed to work with GM, GMC, Chevy, Chrysler, Mopar, Ford and many classic and custom vehicles, reducing the need for model-specific parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e21 Circuit Coverage:\u003c\/strong\u003e Includes dedicated lines for headlights, fan, radio, dome light, gauges and more, so most standard electrical needs are prewired.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e17 Fused Circuits:\u003c\/strong\u003e Built-in fusing for 17 circuits provides basic circuit protection and simplifies fuse panel setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVisible Labels:\u003c\/strong\u003e Labels placed every 5 in and clear color coding make it faster to identify wires and match to components during assembly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Conductors:\u003c\/strong\u003e High quality copper core wire is specified for better conductivity, ductility and resistance to corrosion compared with low grade conductors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExtra Long Wire:\u003c\/strong\u003e Longer lead lengths help reach components in larger engine bays and rat rod layouts, reducing the need for splices.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWho It's For\u003c\/h2\u003e\n\u003cp\u003eThis wiring harness is best for classic car restorers, hot rod builders and DIY mechanics who need a comprehensive, universal wiring solution that covers most accessory and lighting circuits without building a harness from scratch. The pre-labeled circuits and included fuse panel are particularly useful for those working on Chevy RAT ROD builds, Mopar swaps or mixed marque projects where a universal approach saves time.\u003c\/p\u003e\n\u003cp\u003eThose who should look elsewhere are buyers who need vehicle-specific OEM connectors or complete plug-and-play integration for late model computers; this kit is universal and may require trimming, crimping or professional help for complex modern engine management and CAN bus systems.\u003c\/p\u003e\n\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBroad compatibility with many makes and models simplifies parts sourcing for custom builds.\u003c\/li\u003e\n\u003cli\u003eClear labels every 5 in and color coding speed up identification and reduce wiring errors.\u003c\/li\u003e\n\u003cli\u003eHigh quality copper core conductors offer better conductivity and durability than bargain harnesses.\u003c\/li\u003e\n\u003cli\u003eIncludes circuits for common accessories, reducing the number of add-on wiring tasks.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSome users report the wire lengths are acceptable for many builds but can be too short for particular layouts, requiring extensions or rerouting.\u003c\/li\u003e\n\u003cli\u003eInstructions and label readability received mixed feedback, so less experienced installers may want professional help.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eJY PERFORMANCE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCircuits\u003c\/td\u003e\n\u003ctd\u003e21 circuit wiring harness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFuses\u003c\/td\u003e\n\u003ctd\u003e17 fused circuits\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Marking\u003c\/td\u003e\n\u003ctd\u003eLabels every 5 in with color coding\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded Circuits\u003c\/td\u003e\n\u003ctd\u003eHeadlights, fan, radio, dome light, gauges, fuel pump, turn signals, and more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConductor Type\u003c\/td\u003e\n\u003ctd\u003eCopper core wire\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal for GM, Chevy, Mopar, Ford, Chrysler and more\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch2\u003eOur Verdict\u003c\/h2\u003e\n\u003cp\u003eThe 21 Circuit Universal Wiring Harness Kit is a sensible choice for custom and classic car projects where broad compatibility, labeled wiring and multiple fused circuits matter most. It delivers strong value for DIYers and small shops thanks to quality copper conductors and comprehensive circuit coverage, though installers should plan for occasional wire extensions or professional assistance for complex modern systems.\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWill this harness fit my classic Chevy?\u003c\/strong\u003e\u003cbr\u003eIt is a universal harness designed to be compatible with many Chevy and GM models, but specific connector matching and some trimming may be required for exact fit.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes the kit include fuses?\u003c\/strong\u003e\u003cbr\u003eYes, the harness provides 17 fused circuits to protect and organize most common electrical loads.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre the wires labeled?\u003c\/strong\u003e\u003cbr\u003eYes, wires are labeled every 5 in and color coded to help identify each circuit during installation.\u003c\/p\u003e","brand":"JY PERFORMANCE","offers":[{"title":"Default Title","offer_id":48179876364507,"sku":"B0BHL12DRR","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/91K9MQQlYmL._SL1500.jpg?v=1769489570","url":"https:\/\/gearmusthave.com\/products\/21-circuit-universal-wiring-harness-kit-extra-long-wire","provider":"GearMustHave","version":"1.0","type":"link"}