{"product_id":"emp-switch-box-300-01852","title":"EMP Switch Box #300-01852","description":"\u003ch2\u003eEMP 300-01852 Switchbox\u003c\/h2\u003e\n\n\u003cp\u003eThe switch box is the brain of the capacitor discharge ignition system on older Mercury and Mariner outboards. It receives a trigger signal from the stator and timer base, then fires a precisely timed high-voltage charge to the ignition coils, which in turn fire the spark plugs. When the switch box starts to fail, the symptoms can range from subtle to dramatic: intermittent misfires, hard starting when the engine is warm, a cylinder that drops out under load, or in some cases the engine simply refuses to run at all. Because the switch box controls ignition timing and spark delivery, a failing unit can mimic a wide range of other problems, which is why it is often one of the last things diagnosed and one of the most satisfying fixes when it turns out to be the culprit.\u003c\/p\u003e\n\n\u003cp\u003eThe EMP 300-01852 Switch Box fits Mercury and Mariner 3-cylinder outboards in the 65 to 90 horsepower range, as well as V6 outboards in the 135 to 275 horsepower range. It is a direct replacement for nine Mercury part numbers: 7778A12, 7778A6, 7778A7, 7778A9, F7778A9, F749301, 7778A3, 5524A1, and 7778A1. If you are cross-referencing from any of those numbers, you are in the right place.\u003c\/p\u003e\n\n\u003cp\u003eEMP builds this switch box to OEM specifications, so the trigger sensitivity, output voltage, and timing characteristics match what Mercury originally engineered for these engines. At this price point, you are getting a reliable replacement without the dealer markup, and since this is a complete unit rather than a repair, installation is straightforward for anyone comfortable working with marine ignition systems.\u003c\/p\u003e\n\n\u003cp\u003eCompatibility and specs at a glance:\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eFits Mercury and Mariner 3-cylinder outboards, 65 to 90 horsepower\u003c\/li\u003e\n  \u003cli\u003eFits Mercury and Mariner V6 outboards, 135 to 275 horsepower\u003c\/li\u003e\n  \u003cli\u003eCapacitor discharge ignition switch box\u003c\/li\u003e\n  \u003cli\u003eReplaces Mercury 7778A12, 7778A6, 7778A7, 7778A9, F7778A9, F749301, 7778A3, 5524A1, and 7778A1\u003c\/li\u003e\n  \u003cli\u003eBuilt to OEM specifications by EMP\u003c\/li\u003e\n  \u003cli\u003eDirect replacement, no modification required for listed applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cb\u003eNormalized SKU:\u003c\/b\u003e 30001852\u003cbr\u003e\u003cb\u003eUPC Code:\u003c\/b\u003e 840080481555\u003c\/p\u003e","brand":"EMP","offers":[{"title":"Default Title","offer_id":54080995754289,"sku":"EMP-300-01852","price":226.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0015\/7184\/8291\/files\/emp-switch-box-300-01852-840080481555-1237281072.jpg?v=1778307585","url":"https:\/\/www.firstchoicemarine.com\/products\/emp-switch-box-300-01852","provider":"First Choice Marine","version":"1.0","type":"link"}