The Honda Marine 30590-ZV5-003 Exciter Coil Assembly helps generate the electrical energy needed for reliable ignition in compatible Honda Marine outboard engines. It works as part of the ignition system by producing electrical power for the ignition circuit, supporting consistent spark generation and dependable engine operation. Made to replace a worn, damaged, or faulty exciter coil... https://www.wholetoolbox.com/honda-marine-30590-zv5-003-exciter-coil-assembly/30590-ZV5-003.html