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Groundsmaster 4100--D Page 5 -- 13 Electrical System
Warning Lights
Engine Oil Pressure Light
The oil pressure light should come on when the ignition
switch is in the ON position with the engine not running.
Also, it should light with the engine running if the engine
oil pressure drops below 7 PSI (0.5 kg/cm
2
).
1. Disconnect green wire from the oil pressure switch
on the engine (located near the starter motor).
2. Ground green wire to the engine block.
3. Turn ignition switch to ON; the oil pressure light
should come on indicating correct operation of the elec-
trical wiring to the oil pressure switch.
4. Turn ignition switch to OFF. Reconnect green wire to
the oil pressure switch. Apply skin--over grease (Toro
Part No. 505--165) to switch terminal.
High Temperature Warning Light
If the coolant temperature rises to approximately 220
o
F
(105
o
C), the high temperature warning light should illu-
minate as the dual temperature switch terminal closes.
NOTE: If the PTO is engaged when the dual tempera-
ture switch terminal closes, the PTO will disengage.
To test the high temperature warning light and its circuit
wiring, ground the blue wire attached to dual tempera-
ture switch on engine water flange. The high tempera-
ture warning light should illuminate.
Glow Plug Indicator Light
The glow plug indicator light should come on when the
ignitionswitchis placedinON priortoplacing theignition
switch in START. The light should stay lit for approxi-
mately 10 seconds while the ignition switch is left in ON.
Charge Indicator Light
Thechargeindicator lightshouldcome on whentheigni-
tion switch is in ON with the engine not running or with
an improperly operating charging circuit while the en-
gine is running.
Testing Warning Lights
1. Apply 12 VDC to terminals 1A and 2A.
2. Ground terminals 1B and 2B.
3. Both indicator lights should light.
1. Charge indicator
2. Engine oil pressure
3. High temp warning
4. Glow plug indicator
Figure 15
1
2
3
4
Figure 16
1. Charge indicator
2. Engine oil pressure
3. High temp shutdown
4. Glow plug indicator
5. Warning light back
1A (+)1B
2B 2A (+)
1
2
3
4
5
Electrical
System