{"product_id":"switch-box-for-mercury-mariner-6-cyl-175-210-hp-outboards-1997-2005-replaces-18495a31-sierra-mpn-18-99229","title":"Sierra 18-99229 Mercury Mariner Switch Box - 6 Cylinder - Replaces 18495A31, 18495A32, 18495A22, 18495A23 - Fits 175 \u0026 210 HP (1997-2005)","description":"\u003cp\u003eThe Sierra 18-99229 is a Mercury\/Mariner ignition switch box built for 6-cylinder outboard engines. It serves as the ignition switching component in the engine's ignition circuit, directing spark timing signals to keep the engine firing correctly. This switch box is designed as a direct replacement for the factory Mercury\/Mariner switch box on 175 and 210 HP six-cylinder outboards from the 1997-2005 model years, making it a straightforward swap for boat owners dealing with hard starting, misfiring, or a no-spark condition traced back to a failed switch box.\u003c\/p\u003e\u003cp\u003eAs an ignition system component, the switch box works alongside the coils, trigger, and stator to manage spark delivery across all six cylinders. Replacing a worn or failed switch box with the Sierra 18-99229 restores reliable ignition timing without the cost of a full ignition system overhaul. The part is identified by the Sierra part number 18-99229 and is cataloged specifically for the 6-cylinder Mercury\/Mariner application described below.\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 18-99229\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury Mariner Switch Box, 6 Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Count:\u003c\/strong\u003e 6 Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.9 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 7 x 4 x 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282393960\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner 6-cylinder outboard engines, 175 and 210 HP, 1997-2005\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e18495A31\u003c\/li\u003e\n\u003cli\u003e18495A32\u003c\/li\u003e\n\u003cli\u003e18495A22\u003c\/li\u003e\n\u003cli\u003e18495A23\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99229 switch box fit?\u003c\/strong\u003e The Sierra 18-99229 fits Mercury and Mariner 6-cylinder outboard engines rated at 175 and 210 HP, for the 1997-2005 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-99229 switch box replace?\u003c\/strong\u003e It replaces OEM Mercury\/Mariner numbers 18495A31, 18495A32, 18495A22, and 18495A23.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-99229 switch box weigh?\u003c\/strong\u003e It weighs 0.9 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this switch box?\u003c\/strong\u003e The switch box measures 7 x 4 x 2 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99229 a direct replacement for my factory switch box?\u003c\/strong\u003e Yes, the 18-99229 is built to replace the factory Mercury\/Mariner switch box on the 6-cylinder 175 and 210 HP applications listed for this part, using the same OEM cross-reference numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate my switch box needs replacing?\u003c\/strong\u003e Hard starting, engine misfire, or a no-spark condition on a Mercury\/Mariner 6-cylinder outboard often point to a failed switch box like the one the Sierra 18-99229 replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the switch box come with mounting hardware?\u003c\/strong\u003e The Sierra 18-99229 is supplied as the switch box unit itself; check your engine's factory hardware for reuse during installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-99229 work on a 4-cylinder Mercury outboard?\u003c\/strong\u003e No, the 18-99229 is cataloged specifically for 6-cylinder Mercury\/Mariner outboards, not 4-cylinder engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this switch box compatible with both Mercury and Mariner branded outboards?\u003c\/strong\u003e Yes, the Sierra 18-99229 is designed for both Mercury and Mariner 6-cylinder outboards in the 175 and 210 HP range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra part number for this switch box?\u003c\/strong\u003e The part number is 18-99229.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I confirm fitment by cross-referencing my old part number?\u003c\/strong\u003e Yes, if your old switch box is marked 18495A31, 18495A32, 18495A22, or 18495A23, the Sierra 18-99229 is the replacement for it.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988439085275,"sku":"SIE-18-99229","price":471.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-114-4953-32_lg__98750.1748360768.500.750.jpg?v=1785188024","url":"https:\/\/www.goodvibesmarina.com\/products\/switch-box-for-mercury-mariner-6-cyl-175-210-hp-outboards-1997-2005-replaces-18495a31-sierra-mpn-18-99229","provider":"Good Vibes Marina","version":"1.0","type":"link"}