{"product_id":"sierra-18-5881-1-marine-switch-box-for-mercury-mariner-4-cylinder-inline-adi-ignition-outboards-replaces-oem-332-5772a7","title":"Sierra 18-5881 Switch Box for Mercury 120 HP 4-Cylinder Inline Outboards with ADI Ignition","description":"\u003cp\u003eThe Sierra 18-5881 is an ignition switch box engineered for Mercury 120 HP four-cylinder in-line outboards equipped with ADI (alternator driven ignition) ignition systems. It serves as the central switching component in the ignition circuit, controlling current flow to the ignition coil and related components so the engine fires reliably in the demanding marine environment. The unit operates on a 12-volt system at a 5-amp current rating with a normally open, single-circuit contact configuration, and connects into the harness through a clamp-style connector.\u003c\/p\u003e\u003cp\u003eConstruction uses stainless steel and bronze contact materials chosen for resistance to corrosion from moisture and salt exposure, and the housing measures 9.8 x 4.6 x 0.9 inches. Sierra builds this switch box to meet or exceed the performance of the original equipment part it replaces, supplying the same fit and electrical function expected by Mercury 120 HP owners running the affected engine serial ranges.\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 18-5881\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Switch Box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e 4-cylinder in-line outboards with ADI ignition systems, 120 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage:\u003c\/strong\u003e 12 Volts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Rating:\u003c\/strong\u003e 5 Amps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Type:\u003c\/strong\u003e Normally Open\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCircuit Type:\u003c\/strong\u003e 1-way\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Clamp\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Material:\u003c\/strong\u003e Stainless Steel, Bronze\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 9.8 x 4.6 x 0.9 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.17 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Teleflex Marine\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury 120 HP, 1991D-1992C, 1993, 1994, Serial Number E000001-E093699\u003c\/li\u003e\n\u003cli\u003eMercury 120 HP, 1995, Serial Number E093700-E138599\u003c\/li\u003e\n\u003cli\u003eMercury 120 HP, 1991-1992, L-Drive\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-5881 switch box fit?\u003c\/strong\u003e It fits Mercury 120 HP four-cylinder in-line outboards equipped with ADI ignition systems, covering serial number range E000001-E093699 for 1991D-1992C, 1993, and 1994, serial range E093700-E138599 for 1995, and the L-Drive version for 1991-1992.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5881 a genuine replacement or an aftermarket copy?\u003c\/strong\u003e Sierra part 18-5881 is engineered to meet or exceed the performance of the original equipment switch box it replaces, providing the same fit and electrical function for the applicable Mercury 120 HP outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat voltage and amperage does this switch box handle?\u003c\/strong\u003e The 18-5881 operates on a 12-volt marine electrical system and is rated for 5 amps of current.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the physical dimensions of the switch box?\u003c\/strong\u003e The Sierra 18-5881 measures 9.8 x 4.6 x 0.9 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-5881 switch box weigh?\u003c\/strong\u003e It weighs 1.17 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material are the switch contacts made from?\u003c\/strong\u003e The 18-5881 uses stainless steel and bronze contact materials, chosen for resistance to corrosion in the marine environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5881 fit L-Drive Mercury 120 HP outboards?\u003c\/strong\u003e Yes, it fits the 1991-1992 L-Drive version of the Mercury 120 HP outboard in addition to the standard in-line configurations.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of connector does the switch box use?\u003c\/strong\u003e The Sierra 18-5881 connects through a clamp-style connector.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this switch box normally open or normally closed?\u003c\/strong\u003e The 18-5881 uses a normally open contact with a single-circuit (1-way) configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWho manufactures the Sierra 18-5881 switch box?\u003c\/strong\u003e It is manufactured by Teleflex Marine under the Sierra brand.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat ignition system does the 18-5881 work with?\u003c\/strong\u003e This switch box is built for ADI (alternator driven ignition) systems used on Mercury 120 HP four-cylinder in-line outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box when I order the 18-5881?\u003c\/strong\u003e You receive one Sierra 18-5881 switch box.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988340617435,"sku":"SIE-18-5881-1","price":257.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__12511.1753840682.500.750.jpg?v=1785188707","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5881-1-marine-switch-box-for-mercury-mariner-4-cylinder-inline-adi-ignition-outboards-replaces-oem-332-5772a7","provider":"Good Vibes Marina","version":"1.0","type":"link"}