{"product_id":"shift-interrupt-switch-fits-mercruiser-alpha-bravo-engines-replaces-87-814281a5-814281a5","title":"Shift Interrupt Switch – Fits MerCruiser Alpha \u0026 Bravo Engines (Replaces 87-814281A5, 814281A5)","description":"\u003cstyle\u003e\n \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n \/* Base table styles *\/\n table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n table.ss-table th, table.ss-table td {\n padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n }\n\n \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n table.ss-table th {\n white-space:nowrap; \/* Do not wrap *\/\n word-break:normal; \/* Don’t break words *\/\n letter-spacing:normal; \/* Prevent theme styles from stretching letters *\/\n font-weight:600;\n background:#f8fafc;\n }\n\n \/* Small screen optimization *\/\n @media (max-width:480px){\n table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n }\n\u003c\/style\u003e\n\u003csection\u003e\n \u003ch2\u003eProduct Details\u003c\/h2\u003e\n \u003cp\u003eThis \u003cstrong\u003eShift Interrupt Switch – Fits MerCruiser Alpha \u0026amp; Bravo Engines (Replaces 87-814281A5)\u003c\/strong\u003e is engineered for Mercury MerCruiser stern drive engines from model years 1996–2001. It covers 3.0L, 4.3L, 5.0L, and 5.7L models with Alpha One and Bravo outdrives, momentarily cutting ignition to allow for smooth shifting from gear to neutral.\u003c\/p\u003e\n \u003cp\u003eIt is a direct replacement for Mercury\/MerCruiser part numbers 87-814281A5 and 814281A5.\u003c\/p\u003e\n \u003cul\u003e\n \u003cli\u003eInstalls as a direct bolt-on replacement.\u003c\/li\u003e\n \u003cli\u003eFeatures a standard 2-wire electrical connection for easy setup.\u003c\/li\u003e\n \u003cli\u003eConstructed from durable black plastic for longevity in marine environments.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n \u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003ePart Number\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eMercury\/MerCruiser\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMercury\/MerCruiser\u003c\/td\u003e\n \u003ctd\u003e814281A5\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n \u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n \u003cdiv class=\"ss-table-wrap\"\u003e\n \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n \u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eBrand\u003c\/th\u003e\n \u003cth\u003eModel\u003c\/th\u003e\n \u003cth\u003eRated HP\u003c\/th\u003e\n \u003cth\u003eStroke\u003c\/th\u003e\n \u003cth\u003eYears\u003c\/th\u003e\n \u003cth\u003eOEM Part No.\u003c\/th\u003e\n \u003cth\u003eNotes\u003c\/th\u003e\n \u003c\/tr\u003e\n \u003c\/thead\u003e\n \u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e3.0L Alpha One\u003c\/td\u003e\n \u003ctd\u003e135-140\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1996–2001\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003eGM 181 I\/L4\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e3.0LX Alpha One\u003c\/td\u003e\n \u003ctd\u003e135-140\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1996–1997\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003eGM 181 I\/L4\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e4.3L Alpha\/Bravo\u003c\/td\u003e\n \u003ctd\u003e190-225\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1998–2001\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e4.3L CARB ALPHA\/BRAVO\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e4.3L (GEN+)\u003c\/td\u003e\n \u003ctd\u003e190-225\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1996–1997\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e4.3LX (2 BBL) GM 262 V-6\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e4.3LH (GEN+)\u003c\/td\u003e\n \u003ctd\u003e190-225\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1998\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e4.3LH (4 BBL) GM 262 V-6\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e4.3LXH (GEN+)\u003c\/td\u003e\n \u003ctd\u003e190-225\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1996–1997\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e4.3LXH (4 BBL) GM 262 V-6\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e5.0L Alpha\/Bravo\u003c\/td\u003e\n \u003ctd\u003e220-260\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1998–2001\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e5.0L (2 BBL) GM 305 V-8\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e5.0L CARB Alpha\/Bravo\u003c\/td\u003e\n \u003ctd\u003e220-260\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1998–2001\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003eAlpha and Bravo models\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e5.7L Alpha\/Bravo\u003c\/td\u003e\n \u003ctd\u003e250-300\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1997–2001\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e5.7L (2 BBL) GM 350 V-8\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e5.7L CARB Alpha\/Bravo\u003c\/td\u003e\n \u003ctd\u003e250-300\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1997–2001\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003eAlpha and Bravo models\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e5.7LX\u003c\/td\u003e\n \u003ctd\u003e250-300\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1997\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e5.7LX (4 BBL) GM 350 V-8\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003ctr\u003e\n \u003ctd\u003eMerCruiser\u003c\/td\u003e\n \u003ctd\u003e350 MAG Alpha\u003c\/td\u003e\n \u003ctd\u003e300\u003c\/td\u003e\n \u003ctd\u003e4-Stroke\u003c\/td\u003e\n \u003ctd\u003e1997\u003c\/td\u003e\n \u003ctd\u003e87-814281A5\u003c\/td\u003e\n \u003ctd\u003e350 MAG (4 BBL) GM 350 V-8\u003c\/td\u003e\n \u003c\/tr\u003e\n \u003c\/tbody\u003e\n \u003c\/table\u003e\n \u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n \u003cdl\u003e\n \u003cdt\u003eProduct Type\u003c\/dt\u003e\n \u003cdd\u003eShift Interrupter Micro Switch Assembly\u003c\/dd\u003e\n \u003cdt\u003eInstallation\u003c\/dt\u003e\n \u003cdd\u003eDirect Replacement\u003c\/dd\u003e\n \u003cdt\u003eFuel Type\u003c\/dt\u003e\n \u003cdd\u003eGasoline\u003c\/dd\u003e\n \u003cdt\u003eConnection\u003c\/dt\u003e\n \u003cdd\u003e2-Wire Electrical Connection\u003c\/dd\u003e\n \u003cdt\u003eHousing Material\u003c\/dt\u003e\n \u003cdd\u003ePlastic\u003c\/dd\u003e\n \u003cdt\u003eHousing Color\u003c\/dt\u003e\n \u003cdd\u003eBlack\u003c\/dd\u003e\n \u003cdt\u003eFitting Type\u003c\/dt\u003e\n \u003cdd\u003eBolt-on\u003c\/dd\u003e\n \u003cdt\u003eWarranty\u003c\/dt\u003e\n \u003cdd\u003eYes (specifics vary by seller)\u003c\/dd\u003e\n \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n \u003cdd\u003eMomentarily cuts ignition when shifting from gear to neutral under load\u003c\/dd\u003e\n \u003c\/dl\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003e1 x Shift Interrupter Micro Switch Assembly (87-814281A5)\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n \u003col\u003e\n \u003cli\u003eDisconnect the negative battery terminal to prevent electrical shorts.\u003c\/li\u003e\n \u003cli\u003eLocate the shift interrupt switch, typically mounted on the shift linkage plate on the engine.\u003c\/li\u003e\n \u003cli\u003eCarefully unplug the 2-wire electrical connector from the old switch.\u003c\/li\u003e\n \u003cli\u003eRemove the mounting bolts or screws securing the old switch and set it aside.\u003c\/li\u003e\n \u003cli\u003ePosition the new switch onto the mounting plate, ensuring the roller aligns correctly with the shift cam.\u003c\/li\u003e\n \u003cli\u003eSecure the new switch with the original bolts or screws, but do not overtighten.\u003c\/li\u003e\n \u003cli\u003eReconnect the 2-wire electrical connector.\u003c\/li\u003e\n \u003cli\u003eReconnect the battery terminal.\u003c\/li\u003e\n \u003cli\u003eWith the boat in the water or a proper water supply, test the shifting function. The engine should briefly stumble when shifting out of a forward or reverse gear into neutral. Adjust as needed per your service manual.\u003c\/li\u003e\n \u003c\/ol\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n \u003cdetails\u003e\n \u003csummary\u003eHow do I know if my shift interrupt switch is failing?\u003c\/summary\u003e\n \u003cp\u003eCommon symptoms include difficulty shifting out of gear, loud clunking or grinding noises when shifting, or the engine stalling during shifts. A properly functioning system causes a momentary engine \"stumble\" when moving from forward or reverse to neutral; if this doesn't happen, the switch may be faulty or misadjusted.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eWhat is the function of the shift interrupt switch?\u003c\/summary\u003e\n \u003cp\u003eThis switch briefly cuts the engine's ignition for a split second as you shift out of gear. This action reduces the load on the stern drive's dog clutch, allowing the gears to disengage smoothly without damage.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eDoes this switch require adjustment after installation?\u003c\/summary\u003e\n \u003cp\u003eYes, correct adjustment is critical. The roller on the switch must be activated by the cam on the shift linkage at the precise moment it begins to disengage from gear. Consult your engine's official service manual for the detailed adjustment procedure to prevent shifting problems or engine stalling.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eIs this part compatible with both Alpha One and Bravo drives?\u003c\/summary\u003e\n \u003cp\u003eYes, this switch is designed to work with the specified MerCruiser engines from 1996–2001, regardless of whether they are paired with an Alpha One or Bravo outdrive. Always verify your specific model and year in the compatibility list.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n \u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eShipping speed \u0026amp; cost?\u003c\/summary\u003e\n \u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n \u003c\/details\u003e\n \u003cdetails\u003e\n \u003csummary\u003eWarranty \u0026amp; returns?\u003c\/summary\u003e\n \u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n \u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection\u003e\n \u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n \u003cul\u003e\n \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n \u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50718268686651,"sku":"23SH367R1","price":17.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/23SH367R1.png?v=1762958641","url":"https:\/\/seasierra.com\/products\/shift-interrupt-switch-fits-mercruiser-alpha-bravo-engines-replaces-87-814281a5-814281a5","provider":"SeaSierra","version":"1.0","type":"link"}