{"product_id":"thexton-the404-spark-tester-compact-inline-ignition-tester-for-spark-plugs-and-coils-visible-gap-portable-12-cm-size","title":"Thexton THE404 Spark Tester — compact inline ignition tester for spark plugs and coils, visible gap, portable 12 cm size","description":"\u003cp\u003e\u003cstrong\u003eThexton THE404 Spark Tester is a compact auto accessory that quickly checks ignition spark presence and helps diagnose engine ignition issues.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThexton's THE404 Spark Tester is a handheld diagnostic aid designed for mechanics, automotive hobbyists, and roadside repairs. Its small form factor and straightforward function let you verify whether a spark plug, coil, or ignition circuit is producing a visible spark without removing components or relying on complex electronic testers. The tool is built for practical, on-the-spot troubleshooting and comes in a compact package sized roughly 12 cm by 3.4 cm by 8.5 cm.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the THE404 Spark Tester show whether an ignition circuit is working?\u003c\/h3\u003e\n\u003cp\u003eThe tester provides a visible spark path so you can determine if voltage is reaching the spark plug or coil. Connect it inline with the spark plug lead and crank the engine; a bright, consistent spark across the tester indicates ignition activity. It’s a simple optical confirmation rather than a digital measurement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVisible gap that lights when voltage is present\u003c\/li\u003e\n  \u003cli\u003eInline connection for plug leads or coil towers\u003c\/li\u003e\n  \u003cli\u003eQuick confirmation without disassembly\u003c\/li\u003e\n  \u003cli\u003eSafe for spot checks if used as directed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat connectors and sizes does the THE404 fit?\u003c\/h3\u003e\n\u003cp\u003eThexton designed this accessory to be broadly compatible with common automotive ignition components. It fits most standard spark plug leads and coil boots used on gasoline engines. For specialty or high-performance ignition systems, verify physical fit before use.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eWorks with typical spark plug boots and ignition leads\u003c\/li\u003e\n  \u003cli\u003eCompact body to access tight engine bays\u003c\/li\u003e\n  \u003cli\u003eSuitable for many passenger cars and light trucks\u003c\/li\u003e\n  \u003cli\u003eCheck compatibility for unconventional ignition systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I use the tester safely to avoid damage or injury?\u003c\/h3\u003e\n\u003cp\u003eAlways follow basic ignition safety: engine off while making connections, insulated grips, and keeping flammable materials away. Only crank the engine briefly while holding the tester in position and using protective gloves or insulated tools if needed. Avoid prolonged exposure to sparks and keep hands and conductive tools clear of the gap.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMake connections with the engine off, then crank briefly to test\u003c\/li\u003e\n  \u003cli\u003eUse insulated gloves and keep clear of moving engine parts\u003c\/li\u003e\n  \u003cli\u003eDo not hold the tester against metal surfaces during testing\u003c\/li\u003e\n  \u003cli\u003eStore in a dry place to preserve insulation and visibility window\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat size is the THE404 and how portable is it for fieldwork?\u003c\/h3\u003e\n\u003cp\u003eThexton THE404 packs into a small footprint that’s easy to carry in a tool roll or glovebox. Its package dimensions are approximately 11.988 cm in height, 3.378 cm in length, and 8.483 cm in width, making it one of the more compact spark-check tools suitable for roadside diagnostics.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePackage height around 12 cm for easy storage\u003c\/li\u003e\n  \u003cli\u003eLow-profile length and width for tight compartments\u003c\/li\u003e\n  \u003cli\u003eLightweight and simple to slip into a toolbox or bag\u003c\/li\u003e\n  \u003cli\u003eIdeal as a quick-check tool in mobile toolkits\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Thexton THE404 is aimed at DIY mechanics, professional technicians needing a quick verification tool, and drivers who want a compact item for emergency troubleshooting. If you perform routine ignition checks, repair older vehicles, or need a fast way to confirm spark without complex meters, this tester is a practical addition to your kit. It is not a precision voltmeter or timing instrument; rather, it’s a straightforward visual tool for confirming whether an ignition circuit is producing a spark.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can the THE404 test modern coil-on-plug systems?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It can check many common coil-on-plug setups if you can safely access the coil lead; confirm physical fit first.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will the tester damage electronics or coils?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: When used briefly and correctly, it’s a passive visual check and generally won’t harm ignition components.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Thexton","offers":[{"title":"Default Title","offer_id":67591488929977,"sku":"B0002STSBM","price":65.33,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/thexton-the404-front-view.jpg?v=1790552919","url":"https:\/\/redleafauto.ca\/products\/thexton-the404-spark-tester-compact-inline-ignition-tester-for-spark-plugs-and-coils-visible-gap-portable-12-cm-size","provider":"Redleaf Auto","version":"1.0","type":"link"}