{"product_id":"johnson-evinrude-wiring-harness-18-99431-replaces-oem-391818-fits-1982-1984-20-25-30-35-hp-2-cyl-cross-flow-outboards","title":"Sierra Wiring Harness 18-99431, Replaces 391818, Fits Johnson\/Evinrude 2 Cyl Cross Flow 20-35 HP 1982-1984","description":"\u003cp\u003eThe Sierra 18-99431 wiring harness is a direct-fit replacement wiring harness built for Johnson\/Evinrude 2 cylinder Cross Flow outboard engines. It supplies the connector runs needed to link the engine's ignition and charging components to the control box and gauges, restoring a clean, factory-style electrical connection when an original harness has cracked, corroded, or failed. The harness is constructed of copper conductors insulated in PVC or PE jacketing, materials chosen for resistance to moisture, fuel vapor, and the vibration common in an outboard engine compartment. It uses a marine engine connector interface, allowing it to mate with the factory-style plugs on compatible powerheads without modification.\u003c\/p\u003e\u003cp\u003eThis harness replaces OEM part number 391818 and fits Johnson\/Evinrude 2 cylinder Cross Flow outboards from 1982-1984 rated at 20, 25, 30, and 35 HP. Replacing a deteriorated wiring harness restores reliable continuity across the ignition circuit, helping eliminate intermittent starting, stalling, or charging issues traced to worn or brittle wiring.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-99431\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 391818\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Copper, PVC or PE\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 9 x 7 x 2.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.6 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Marine Engine Connector\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394622\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude 2 Cylinder Cross Flow outboards, 1982-1984, 20, 25, 30 and 35 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e391818\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99431 wiring harness fit?\u003c\/strong\u003e The Sierra 18-99431 wiring harness fits Johnson\/Evinrude 2 cylinder Cross Flow outboards from 1982-1984 rated at 20, 25, 30, and 35 HP.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does this harness replace?\u003c\/strong\u003e Sierra 18-99431 replaces OEM part number 391818 on compatible Johnson\/Evinrude 2 cylinder Cross Flow outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-99431 harness made of?\u003c\/strong\u003e It is built with copper conductors insulated in PVC or PE jacketing, materials selected for durability against moisture and vibration in the engine compartment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this wiring harness weigh?\u003c\/strong\u003e The Sierra 18-99431 wiring harness weighs 0.6 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the harness?\u003c\/strong\u003e The harness measures 9 x 7 x 2.5 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this harness use the factory connector?\u003c\/strong\u003e Yes, part number 18-99431 uses a marine engine connector designed to mate with the factory-style plugs on compatible Johnson\/Evinrude powerheads.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this harness work on a 3 or 4 cylinder Johnson\/Evinrude engine?\u003c\/strong\u003e No, the Sierra 18-99431 is built for 2 cylinder Cross Flow outboards only; a different harness is required for 3 or 4 cylinder applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a new replacement part or a repair kit for the original harness?\u003c\/strong\u003e The 18-99431 is a complete new replacement wiring harness, not a repair kit for the original wiring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace the wiring harness on my outboard?\u003c\/strong\u003e A cracked, corroded, or brittle wiring harness can cause intermittent starting, stalling, or charging problems; replacing it with the Sierra 18-99431 restores a clean, continuous connection between the engine and control box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-99431 include connectors at both ends?\u003c\/strong\u003e Yes, the harness comes complete with its marine engine connector interface for connecting to the engine's ignition and charging components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99431 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-99431 is an aftermarket replacement harness manufactured to replace OEM part number 391818 on the applicable Johnson\/Evinrude engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988444131547,"sku":"SIE-18-99431","price":157.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-413-1818_lg__36951.1558111376.500.750.jpg?v=1785188066","url":"https:\/\/www.goodvibesmarina.com\/products\/johnson-evinrude-wiring-harness-18-99431-replaces-oem-391818-fits-1982-1984-20-25-30-35-hp-2-cyl-cross-flow-outboards","provider":"Good Vibes Marina","version":"1.0","type":"link"}