Honda GX690 Workshop Manual page 48

TROUBLESHOOTING
ENGINE DOES NOT STOP WHEN COMBINATION SWITCH IS TURNED OFF
Check the continuity of the wire harness
connecting the combination switch and
ignition coils (Yellow).
Continuity
Check the continuity between IGN terminal
(Black) of the combination switch and the
engine ground at ON position (page 11-4).
No continuity
Replace the ignition coil with a new one, and
recheck.
4-4
No continuity
Replace the engine wire harness.
Continuity
Replace the combination switch (page 7-10).