{"product_id":"84303178-genuine-gm-engine-wiring-harness-junction-block-for-silverado-sierra-4-3l-5-3l-6-2l","title":"84303178 Genuine GM Engine Wiring Harness Junction Block For Silverado Sierra 4.3L 5.3L 6.2L","description":"\u003ch2 data-end=\"779\" data-start=\"479\"\u003eDescription\u003c\/h2\u003e\n\u003cp data-start=\"111\" data-end=\"601\"\u003eThe 84303178 is a genuine GM engine wiring harness junction block designed to coordinate electrical connections between the engine harness, fuse system, and vehicle control circuits. This component functions as a centralized interface that routes power and signal pathways required for proper engine electrical operation.\u003c\/p\u003e\n\u003ch2\u003eVehicle Compatibility\u003c\/h2\u003e\n\u003ctable style=\"width: 100%; height: 438px;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003cth style=\"width: 6.11511%; text-align: center;\"\u003e\u003cstrong\u003eYear\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 21.223%; text-align: center;\"\u003e\u003cstrong\u003eVehicle\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 44.2446%; text-align: center;\"\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/th\u003e\n\u003cth style=\"width: 27.6978%; text-align: center;\"\u003e\u003cstrong\u003eTrims\u003c\/strong\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2019\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 1500 LD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e5.3L V8 Flex, 5.3L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eCustom, LT, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 10px;\"\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2019\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 2500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eHigh Country, LT, LTZ, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2019\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 3500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eHigh Country, LT, LTZ, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2019\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 1500 Limited\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e5.3L V8 Flex, 5.3L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, SLE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2019\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 2500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2019\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 3500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2018\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 1500\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e4.3L V6 Flex, 5.3L V8 Electric\/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eCustom, High Country, LS, LT, LTZ, SSV, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2018\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 2500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 CNG, 6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eHigh Country, LT, LTZ, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2018\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 3500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eHigh Country, LT, LTZ, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2018\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 1500\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e4.3L V6 Flex, 5.3L V8 Electric\/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2018\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 2500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2018\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 3500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2017\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 1500\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e4.3L V6 Flex, 5.3L V8 Electric\/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eCustom, High Country, LS, LT, LTZ, SSV, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2017\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 2500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eHigh Country, LT, LTZ, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2017\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eChevrolet Silverado 3500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eHigh Country, LT, LTZ, WT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2017\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 1500\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e4.3L V6 Flex, 5.3L V8 Electric\/Gas, 5.3L V8 Flex, 5.3L V8 Gas, 6.2L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2017\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 2500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 6.11511%;\"\u003e2017\u003c\/td\u003e\n\u003ctd style=\"width: 21.223%;\"\u003eGMC Sierra 3500 HD\u003c\/td\u003e\n\u003ctd style=\"width: 44.2446%;\"\u003e6.0L V8 Flex, 6.0L V8 Gas\u003c\/td\u003e\n\u003ctd style=\"width: 27.6978%;\"\u003eBase, Denali, SLE, SLT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2\u003eGeneral Specifications\u003c\/h2\u003e\n\u003cdiv style=\"width: 100%; display: block;\"\u003e\n\u003ctable class=\"product-table\" style=\"height: 196px; width: 100% !important; table-layout: fixed !important; display: table !important;\"\u003e\n\u003ccolgroup\u003e \u003ccol style=\"width: 29.6343%;\"\u003e \u003ccol style=\"width: 69.9874%;\"\u003e \u003c\/colgroup\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e84303178\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003eGM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003eEngine Wiring Harness Junction Block\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eYears\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e2017–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eVehicle\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003eChevrolet Silverado \/ GMC Sierra\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eEngine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e4.3L V6, 5.3L V8, 6.0L V8, 6.2L V8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e15.4 x 9.6 x 5.3 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e3.70 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.6px;\"\u003e\n\u003ctd style=\"height: 19.6px;\"\u003e\u003cstrong\u003eFitment Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"height: 19.6px;\"\u003eDirect Replacement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cp data-end=\"1574\" data-start=\"1555\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch2 data-end=\"1574\" data-start=\"1555\"\u003eProduct Features\u003c\/h2\u003e\n\u003cp\u003eThe 84303178 engine wiring harness junction block is built to match factory electrical system performance and installation requirements:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine GM engine wiring harness junction block\u003c\/li\u003e\n\u003cli\u003eCentral distribution point for engine electrical connections\u003c\/li\u003e\n\u003cli\u003eRoutes power and signal circuits between engine systems and fuse components\u003c\/li\u003e\n\u003cli\u003eDesigned to follow the original GM harness layout and mounting locations\u003c\/li\u003e\n\u003cli\u003eSupports proper routing of engine control and electrical supply circuits\u003c\/li\u003e\n\u003cli\u003eFactory-style connectors provide accurate electrical engagement\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2 data-end=\"1913\" data-start=\"1893\"\u003eApplication Notes\u003c\/h2\u003e\n\u003cp data-end=\"3938\" data-start=\"3656\"\u003eThe 84303178 is designed for GM truck platforms that use this style junction block to organize electrical connections between engine harness circuits and fuse systems. It installs in the original mounting position and connects directly to the factory wiring harness connectors.\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cp data-end=\"4041\" data-start=\"3940\"\u003eAlways verify part number, engine configuration, and system type before installation.\u003c\/p\u003e\n\u003c\/blockquote\u003e","brand":"GM","offers":[{"title":"Default Title","offer_id":48431893479651,"sku":"84303178","price":348.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0769\/5122\/4547\/files\/s-l1600_49bfd090-eda2-425c-b603-ae0f094dd6e3.webp?v=1772809642","url":"https:\/\/unitautoparts.com\/products\/84303178-genuine-gm-engine-wiring-harness-junction-block-for-silverado-sierra-4-3l-5-3l-6-2l","provider":"Unit Auto Parts","version":"1.0","type":"link"}