Abstract: A self-latching relay is connected in series with the ignition circuit of a power boat to interrupt power to the starter and ignition circuits until the relay is actuated. A thermal delay timer is connected to one of the control switches for the bilge blower system to time a predetermined interval after the bilge blower has been turned on. After the interval has been timed the ignition circuit is completed through the self-latching relay. An emergency override circuit is provided to bypass the timer, but includes warning means which continue in operation until the engine is stopped and restarted without the aid of the emergency override switch.