{"product_id":"sierra-18-99562-sealed-threaded-spark-tester-inline-ignition-spark-gap-tester-for-marine-outboard-engines","title":"Sierra Spark Gap Tester 18-99562, Sealed Threaded Marine Ignition Tester","description":"\u003cp\u003eThe Sierra Spark Gap Tester 18-99562 is a sealed, threaded diagnostic tool used to check for spark output on marine ignition systems before troubleshooting deeper into a no-start or misfire complaint. Instead of pulling a spark plug and guessing at spark quality by eye near an open cylinder, this tester threads into the ignition circuit and gives a visible, repeatable spark gap reference so you can confirm the coil, ignition module, or power pack is actually firing. It is battery powered, so no external power source or bench supply is needed to run a test at the boat or in the shop.\u003c\/p\u003e\u003cp\u003eThe sealed threaded body is built to hold up to marine engine-bay conditions where moisture and vibration are a constant concern, and its simple design means there is nothing to calibrate or configure before use. At 1 pound, it is light enough to keep in a tool bag alongside other ignition and electrical diagnostic equipment. This tester is a straightforward, single-purpose tool for verifying spark presence on marine engines during routine maintenance or fault-finding.\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 18-99562\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Spark Gap Tester\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Sealed, threaded body\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Source:\u003c\/strong\u003e Battery powered\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1 pound\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282395650\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Specialty Tools\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99562 spark gap tester do?\u003c\/strong\u003e It checks for spark output from a marine ignition system by threading into the circuit and displaying a visible spark across a fixed gap, letting you confirm the coil, ignition module, or power pack is firing without pulling a plug near an open cylinder.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99562 battery powered?\u003c\/strong\u003e Yes, the 18-99562 spark gap tester is battery powered, so it can be used at the boat or in the shop without a separate power supply.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra spark gap tester weigh?\u003c\/strong\u003e The Sierra 18-99562 weighs 1 pound, making it easy to store in a tool bag with other ignition diagnostic equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this tester sealed against moisture?\u003c\/strong\u003e Yes, the 18-99562 has a sealed, threaded body designed to hold up in a marine engine bay where moisture and vibration are a factor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any tools to use the 18-99562 spark tester?\u003c\/strong\u003e No additional tools are required; the tester threads directly into the ignition circuit and is battery powered, so it is ready to use on its own.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with the Sierra 18-99562?\u003c\/strong\u003e The Sierra 18-99562 ships as a complete, ready-to-use sealed threaded spark gap tester; no separate power source is needed since it is battery powered.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-99562 be used on both inboard and outboard ignition systems?\u003c\/strong\u003e The 18-99562 is built as a general-purpose marine spark gap tester for checking ignition spark output; it is not tied to a single engine type in its design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy use a spark gap tester instead of just pulling a spark plug to look for spark?\u003c\/strong\u003e A sealed threaded tester like the 18-99562 gives a consistent, repeatable gap to check spark against, rather than relying on visually judging spark quality near an open cylinder, which is harder to read and less safe.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99562 a genuine Sierra part?\u003c\/strong\u003e Yes, 18-99562 is the Sierra manufacturer part number for this sealed threaded spark gap tester.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of tool is the 18-99562?\u003c\/strong\u003e The 18-99562 is listed as a specialty tool, specifically a spark gap tester for marine ignition diagnostics.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988446654683,"sku":"SIE-18-99562","price":112.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-511-9766T_lg__11197.1558114704.500.750.jpg?v=1785189054","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-99562-sealed-threaded-spark-tester-inline-ignition-spark-gap-tester-for-marine-outboard-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}