Component Testing; Ignition Switch - Toro Groundsmaster
4000?D Service Manual

PRELIMINARY – For Toro Distributor and Toro Company use only.

Component Testing

For accurate resistance and/or continuity checks, elec-
trically disconnect the component being tested from the
circuit (e.g. unplug the ignition switch connector before
doing a continuity check).
NOTE: For engine component testing information, see
the Kubota Workshop
V2403−M−T−E3B Series at the end of Chapter 3 − Ku-
bota Diesel Engine.

Ignition Switch

The ignition (key) switch has three (3) positions: OFF,
ON/ PREHEAT and START (Fig. 7). The terminals are
marked as shown in Figure 8. The circuit wiring of the
ignition switch is shown in the chart below. With the use
of a multimeter (ohms setting), the switch functions may
be tested to determine whether continuity exists be-
tween the various terminals for each position. Verify
continuity between switch terminals.
POSITION
OFF
ON / PREHEAT
START
Groundsmaster 4000−D
Manual, Diesel Engine,
CIRCUIT
NONE
B + I + A, X + Y
B + I + S
Page 5 − 9
CAUTION
When testing electrical components for continu-
ity with a multimeter (ohms setting), make sure
that power to the circuit has been disconnected.
OFF
45 °
Figure 7
B
S
I
Figure 8
ON / PREHEAT
45 °
START
A
Y
X
Electrical System