Key Switch; Purpose; How It Works; Testing - Toro 74161 Service Manual

Purpose

The key switch provides proper switching of the start,
run, stop, and interlock circuits.

How It Works

Detents inside the switch give it three positions: "OFF",
"RUN", and "START". The "START" position is spring
loaded so the switch returns to the "RUN" position
when the key is released.

Testing

1. Disconnect the switch from the wiring harness.
2. Verify the conditions in the table.
3. There should not be continuity between any of the
switch terminals and ground.
KEY SWITCH LOGIC
Position
Off
On
Start
Mid-Mount Z Service Manual
Engine
Kill
Circuit
E-G
B-A
B -A-S
Accessory
ELECTRICAL SYSTEMS

Key Switch

Start
Battery
Ground
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