Electrical; Component Testing; Ignition Switch; Purpose - Toro GrandStand 74534 Service Manual

Additional information can be found in the LCE Electrical
Troubleshooting DVD #492-9193, available through your
Toro parts supplier.
CAUTION
Before performing any tests with a continuity light or
ohmmeter, disconnect the component from the wire
harness. This ensures you are testing the component
rather than another circuit.
Interlock modules MUST be removed from the circuit
before performing any tests with an ohmmeter or
continuity light. Battery voltage can damage these
modules if applied to the wrong terminals.

Component Testing

Ignition Switch

Purpose

The ignition switch provides the proper switching for the
starter, ignition, accessories, and safety circuits.

Location

The ignition switch is located on the control panel (Fig.
723).
Fig. 723
36" & 40" Toro GrandStand Service Manual

How It Works

Detents inside the switch gives it 3 positions: OFF, RUN
and START. The START position is spring loaded so the
cylinder automatically returns to RUN once the key is
released (Fig. 724).
B - Battery voltage "in"
S - Starting circuit
I - Safety & starting circuit
A - Auxiliary circuit

Testing

1. Disconnect the switch from the wire harness.
2. Verify that continuity exists between the terminals
listed for the switch position (see table below). Verify
that there is NO continuity between the terminals not
listed for the switch position (see table below):
OFF No continuity between terminals
RUN Continuity – B I A and X Y
START Continuity – B I S
DSCN-2194a

ELECTRICAL

X
Y
S
B
A
Fig. 724
Y - Alternator/Regulator
circuit
X - Alternator/Regulator
circuit
I
IMG-1192a
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