{"product_id":"stock-main-relay","title":"Stock Main Relay","description":"The Flyin Miata B5B4-18-811 is a direct replacement stock main relay designed for NA and NB Mazda Miatas. This essential component powers crucial vehicle systems, including the Engine Control Unit (ECU), fuel pump, and ignition system. Mechanical relays, like this one, are prone to wear and tear after decades of use, and can fail without warning.\n\nWhen a main relay fails, it typically results in the engine stopping abruptly, potentially leaving the vehicle stranded. This failure can occur while driving or prevent the car from starting altogether. Higher-current aftermarket fuel pumps can exacerbate the wear on the stock relay, hastening its demise. Replacing the relay proactively or carrying a spare in the glovebox is a common preventative measure.\n\nWhen replacing the original relay, inspect the fusebox socket for corrosion. Cleaning any corroded contacts is recommended to ensure proper electrical connection and prevent heat buildup, which can be caused by increased resistance. This particular relay is a factory replacement for 1996-2005 models and is compatible with all NA\/NB Miatas, including the 1990-1997, 1999-2005, and 2004-2005 MSM variants. For vehicles with higher power fuel pumps or upgraded ignition systems, an 80A version is recommended.","brand":"Flyin Miata","offers":[{"title":"Default Title","offer_id":52688386687288,"sku":"B5B4-18-811","price":25.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/662660917.webp?v=1784889429","url":"https:\/\/store.motormia.co\/products\/stock-main-relay","provider":"MOTORMIA","version":"1.0","type":"link"}