Kohler K91 Owner's Manual page 201

Step
3:
If the engine started with the magneto wire
removed, we have to assume we are having
problems in our kill relay circuit. First
connect a test light or meter to the black
wire located on the ignition switch
(I-terminal). Try starting the unit. If
we show voltage continue to Step
4.
F i g . 4 3
Step 4: Inspect the connections to the kill relay and
PTO interlock switch. Make sure the kill
relay has a good ground.
F i g .
44
F i g . 45