{"product_id":"ballast-resistor-2-5-ohm-for-johnson-evinrude-outboard-ignition-sierra-18-99381","title":"Sierra Ballast Resistor 2.5 Ohm for Johnson Evinrude Outboard Ignition Systems (18-99381)","description":"\u003cp\u003eThe Sierra 18-99381 is a 2.5 Ohm ballast resistor built for the Johnson Evinrude outboard electrical system. A ballast resistor is wired into the ignition circuit to regulate current flow to the coil, helping protect ignition components from excess voltage during operation. This resistor is a compact, lightweight component at just 0.3 pounds, making it a straightforward part to keep on hand for outboard electrical system service and repair. It is identified by Sierra part number 18-99381 and UPC 808282399269, so it can be ordered and verified with confidence. As an electrical system component, it is intended to be installed by someone familiar with outboard ignition wiring, matching the resistor into the existing circuit in place of a resistor of the same 2.5 Ohm rating.\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 18-99381\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e 2.5 Ohm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Johnson Outboard Electrical System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282399269\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-99381?\u003c\/strong\u003e It is a 2.5 Ohm ballast resistor for the Johnson Evinrude outboard electrical system, identified by Sierra part number 18-99381.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat resistance value does this ballast resistor have?\u003c\/strong\u003e The Sierra 18-99381 ballast resistor is rated at 2.5 Ohm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99381 ballast resistor weigh?\u003c\/strong\u003e This ballast resistor weighs 0.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat brand is part number 18-99381?\u003c\/strong\u003e Part number 18-99381 is manufactured by Sierra.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat system is the 18-99381 resistor designed for?\u003c\/strong\u003e The 18-99381 is built for the Johnson Evinrude outboard electrical system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a ballast resistor do in an outboard ignition system?\u003c\/strong\u003e A ballast resistor is wired into the ignition circuit to regulate current reaching the coil, which helps manage voltage during engine operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there a UPC I can use to verify the 18-99381 resistor?\u003c\/strong\u003e Yes, the Sierra 18-99381 ballast resistor carries UPC 808282399269.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99381 resistor a small, lightweight part?\u003c\/strong\u003e Yes, at 0.3 pounds it is a compact component of the outboard electrical system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-99381 resistor as a replacement in the ignition circuit?\u003c\/strong\u003e The Sierra 18-99381 is a 2.5 Ohm ballast resistor intended for use in the Johnson Evinrude outboard electrical system in place of a resistor of the same rating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-99381 ballast resistor categorized?\u003c\/strong\u003e It is listed under Johnson Outboard Electrical System, reflecting its role in the ignition circuit of Johnson Evinrude outboards.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988442263771,"sku":"SIE-18-99381","price":67.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/cdi-121-br50-2.5_lg__11390.1558139046.500.750.jpg?v=1785329151","url":"https:\/\/www.goodvibesmarina.com\/products\/ballast-resistor-2-5-ohm-for-johnson-evinrude-outboard-ignition-sierra-18-99381","provider":"Good Vibes Marina","version":"1.0","type":"link"}