1997+ Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-826148R2, Page 67Get this manual
Stop Circuit To stop the engine, the stop switch is closed allowing the capacitor charge current from the stator to drain directly to groundNOTE: The CDM contains zener diode (not shown for clarity)This diode prevents overcharging of the capacitor (and possible failure) if the SCR does not receive trigger pulseS NS