Electrical System Electronic Ignition Systems Tests Special Tools Required: NOTE: Ignition tester must be used to test ignition on these engines. Use of any other tester can result in inaccurate fi ndings. Battery on unit must be fully charged and properly connected before performing tests (a battery that is hooked up or charged backward will crank engine but it won’t have spark). Be certain drive is in neutral and all external loads are disconnected. ● Hand tachometer. ● Ignition tester. ● Automotive timing light. ● Multi-meter (digital). Specifi cations Required: ● 0.76 mm (0.03 in.). Test Ignition Systems NOTE:
If engine starts or runs during testing, you may need to ground kill lead to shut it down. Because you have interrupted kill circuit, it may not stop using switch. Isolate and verify trouble is within engine. 1. Locate connectors where wiring harnesses from engine and equipment are joined. Separate connectors and remove white kill lead from engine connector. Rejoin connectors and position or insulate kill lead terminal so it cannot touch ground. Try to start engine to verify whether reported problem is still present. Condition Possible Cause Conclusion 66 690 01 Rev.
C KohlerEngines.com 31 A Accessory (Yellow) B Battery (Red) C Starter (Blue/Red) D Run (Red) E Ignition Kill (White) F Key Switch Ground (Black) G Ground H Starter I Battery J Accessory K Key Switch L Ignition Kill M Run N Yellow O Connector P Starter Solenoid Stud Q Starter Solenoid Tang R Starter Assembly S Fuse T Red U Black V White W Carburetor X Intake Manifold Screw Y Ground (Black) Z Oil Sentry Light TM AA Carburetor Solenoid AB Regulator Recifi er (15 Amp) AC Regulator Connector AD AC AE B+ AF Stator AC (White) AG Purple AH Regulator Rectifi er (25 Amp) AI Blower Housing Safety Switch AJ Spark Plug(s) AK Ignition Module(s) AL Flywheel Stator Assembly AM Coolant Temp.
Switch AN Oil Pressure Switch AO Orange AP Coolant Temp. Gauge AQ Coolant Temp. Over-heat Alarm AR Blue AS Accessory Terminal (+) Problem goes away. Electrical System Check key switch, wires, connections, safety interlocks, etc. Problem persists. Ignition or Electrical System Leave kill lead isolated until all testing is completed. Identify white kill lead of engine wiring harness connector. Establish a connection to a known good ground location. Engine should kill completely. If not or only one cylinder is affected, test ignition modules and white kill lead connection.