1996-2005 Suzuki DF40, DF50 Four Stroke Outboard Service Manual, Page 66Get this manual
3-11 ENGINE CONTROL SYSTEM
IGNITION SYSTEM
The ignition system used by the DF40DF50 is fully transistorized, electronic microcomputer timing advanced typeOn this system, power is totally supplied from the battery with the ECM controlling all ignition timing functionsThe ignition system is composed of the ignition coil, spark plug and components for system control (ECM, sensor,switch etc When the ignition switch is "ON", battery voltage (12V) is applied to the circuit as shown in the illustrationAt the calculated time of ignition, the transistor in the ECM turns "OFF", breaking the ground circuitIn this way, mutual induction high voltage occurs in the ignition coil secondary side and spark is generated
ECM Battery charge coil ECM main relay CPU Sensorswitch signal input
Rectifierregulator 30A fuse
Spark timing
Ignition coil Ignition switch Spark plug (Voltage)