I have a 1985 90HP V4 Evinrude I bought second hand and I have no idea what the charging system is regulated or unregulated? I need a new Tach and there is a difference when buying certain tachs. The book shows both systems. Thanks
Hey Kart33,<br />Easiest way I know to check it is to measure the voltage at the battery with the engine running. Should be around 13.5 to 14 volts if it's charging. <br />Backlash