{"product_id":"holley-efi-terminator-x-x-max-input-output-harness-8-pin","title":"Holley EFI Terminator X \u0026 X Max Input\/Output Harness – 8 Pin","description":"\u003cp\u003eThe \u003cstrong\u003eHolley EFI Terminator X \u0026amp; X Max Input\/Output Harness – 8 Pin\u003c\/strong\u003e expands the capabilities of your Holley EFI engine management system by providing full access to all available ECU inputs and outputs. This auxiliary harness is designed for \u003cstrong\u003eTerminator X and Terminator X Max ECUs\u003c\/strong\u003e, offering four programmable inputs and four programmable outputs for integrating additional sensors, switches, relays, and accessories.\u003c\/p\u003e\n\u003cp\u003eThis 36-inch harness features pre-terminated flying leads, a sealed ECU connector, and all eight terminals populated. While some Terminator X kits include only a three-wire I\/O harness, this upgraded harness unlocks the ECU's complete I\/O functionality, making it ideal for advanced EFI installations and custom vehicle builds.\u003c\/p\u003e\n\u003ch4\u003eIncludes:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e(1) Holley EFI Terminator X \u0026amp; X Max Input\/Output Harness\u003c\/li\u003e\n\u003cli\u003eSealed 8-Pin ECU Connector\u003c\/li\u003e\n\u003cli\u003eEight Pre-Terminated Flying Leads\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eHolley EFI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003e558-462\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eAuxiliary Input\/Output Harness\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHarness Type\u003c\/td\u003e\n\u003ctd\u003eAuxiliary\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatible ECU\u003c\/td\u003e\n\u003ctd\u003eTerminator X and Terminator X Max\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInputs\u003c\/td\u003e\n\u003ctd\u003e4 Programmable Inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003e4 Programmable Outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Quantity\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Gauge\u003c\/td\u003e\n\u003ctd\u003e20 AWG\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWire Colors\u003c\/td\u003e\n\u003ctd\u003eWhite with Stripes, Gray with Stripes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHarness Length\u003c\/td\u003e\n\u003ctd\u003e36 Inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eSealed 8-Pin Female ECU Connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLead End\u003c\/td\u003e\n\u003ctd\u003eUnterminated Flying Leads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ctable class=\"custom-specs-table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eEFI System\u003c\/th\u003e\n\u003cth\u003eCompatibility\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHolley Terminator X ECU\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHolley Terminator X Max ECU\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Style\u003c\/td\u003e\n\u003ctd\u003e8-Pin Sealed ECU Connector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eUniversal EFI Installations\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eFitment Notes\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for Holley Terminator X and Terminator X Max ECUs.\u003c\/li\u003e\n\u003cli\u003eProvides access to all four programmable inputs and four programmable outputs available in the ECU.\u003c\/li\u003e\n\u003cli\u003eSome Terminator X kits include only a three-wire I\/O harness; this harness expands the system to all eight available circuits.\u003c\/li\u003e\n\u003cli\u003eUnterminated flying leads allow custom wiring to switches, relays, sensors, and accessories.\u003c\/li\u003e\n\u003cli\u003eVerify ECU compatibility before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e\n\u003cdetails class=\"details\"\u003e\n\u003csummary\u003e\u003cstrong\u003eTech Insight\u003c\/strong\u003e\u003cspan class=\"svg-wrapper icon-plus\"\u003e\u003csvg width=\"14\" height=\"14\" viewbox=\"0 0 14 14\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\u003e\u003cpath class=\"vertical\" d=\"M2.75 7H11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003cpath class=\"horizontal\" d=\"M7 2.75L7 11.25\" stroke=\"currentColor\" stroke-width=\"var(--icon-stroke-width)\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\u003c\/svg\u003e\u003c\/span\u003e\u003c\/summary\u003e\n\u003cdiv class=\"details-content rte\"\u003e\n\u003ch3\u003e1. What is this harness used for?\u003c\/h3\u003e\n\u003cp\u003eThis harness provides complete access to the Terminator X or Terminator X Max ECU's four programmable inputs and four programmable outputs, allowing additional sensors, switches, relays, and electronic accessories to be integrated into the EFI system.\u003c\/p\u003e\n\u003ch3\u003e2. Why would I need this harness if my EFI kit already includes one?\u003c\/h3\u003e\n\u003cp\u003eSome Terminator X kits are supplied with only a three-wire I\/O harness. The 558-462 harness populates all eight available terminals, allowing you to utilize every programmable input and output built into the ECU.\u003c\/p\u003e\n\u003ch3\u003e3. What can the programmable inputs and outputs control?\u003c\/h3\u003e\n\u003cp\u003eThe ECU can be configured to monitor or control a wide variety of accessories depending on your calibration, including switches, warning lights, relays, electric fans, boost control devices, nitrous systems, and other programmable functions supported by the ECU.\u003c\/p\u003e\n\u003ch3\u003e4. Why are the leads left unterminated?\u003c\/h3\u003e\n\u003cp\u003eFlying leads allow builders to cut each wire to the exact length needed and terminate it with the connector best suited for the specific component being installed, resulting in a cleaner custom wiring job.\u003c\/p\u003e\n\u003ch3\u003e5. Is this harness weather resistant?\u003c\/h3\u003e\n\u003cp\u003eYes. The ECU connection uses a sealed connector to help protect the electrical terminals from moisture, dirt, and vibration commonly encountered in automotive, racing, and off-road environments.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003chr\u003e","brand":"Holley","offers":[{"title":"Default Title","offer_id":56886391341222,"sku":"558-462","price":42.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0693\/8394\/6406\/files\/558-462-Holley-EFI-Terminator-Wiring-Harness-1.jpg?v=1785441382","url":"https:\/\/wideopendesign.com\/products\/holley-efi-terminator-x-x-max-input-output-harness-8-pin","provider":"Wide Open Design","version":"1.0","type":"link"}