Glow Controller - Toro Groundsmaster
4000?D Service Manual

PRELIMINARY – For Toro Distributor and Toro Company use only.

Glow Controller

The glow controller is located under the console cover.
NOTE: Refer to Chapter 9 − Foldout Drawings when
troubleshooting the controller.
Controller Operation
1. When the ignition switch is placed in the ON position,
the controller energizes the glow plugs and lights up the
glow lamp for approximately 10 seconds.
2. When the ignition switch is held in the START posi-
tion, the glow plugs will energize and the glow lamp will
not light.
3. When the ignition switch is released from START to
ON, the glow plugs will deenergize and the glow lamp
will remain off.
Controller Checks
1. Make sure there is power from the battery.
2. Disconnect electrical connector to the run solenoid
to prevent the engine from starting.
3. Place ignition switch in the ON position. Verify the fol-
lowing while in the ON position:
A. Glow indicator lamp is on.
B. Glow relay is energized.
C. Glow plugs are energized.
D. Glow indicator lamp goes out and glow plugs de−
energize after approximately 10 seconds.
4. Place ignition switch in the START position. Verify
the following while in the START position:
A. Glow indicator lamp is out.
B. Glow relay is energized.
C. Glow plugs are energized.
D. Power to terminal 1 of the glow controller.
NOTE: If there is no power to terminal 1 of the glow con-
troller, verify continuity of the circuitry from the ignition
switch to the controller and perform step 4 again (see
Chapter 9 − Foldout Drawings).
Electrical System
1
VIOLET
ORANGE
YELLOW
1. Glow controller end view
5. If any of the conditions in step 3 are not met or power
to terminal 1 exists and any of the other conditions in
step 4 are not met:
A. Verify continuity of the circuitry from the battery to
the glow relay and glow plugs (see Chapter 9 − Fold-
out Drawings).
B. Verify continuity of the circuitry from the battery to
ignition switch, glow controller, glow lamp, glow relay
and ground (see Chapter 9 − Foldout Drawings).
C. Replace parts as necessary.
6. Connect electrical connector to the run solenoid.
Page 5 − 22
CONTROLLER
CONNECTIONS
1 4 TEMP (not used)
START
LAMP 2 5 GLOW
6 GROUND
+12V 3
Figure 29
2. Controller side view
Groundsmaster 4000−D
3 6
2 5
1 4
2
BROWN
BLACK