Filter
Top Products
Groundsmaster 3000/3000–D
Page 6 – 26
Electrical System
Indicator Lights and Circuits (GM 3000–D)
Note: Individual light bulbs can be tested by removing
them from the lighting cluster and applying 12 VDC to
their wiring terminals (Fig 46).
Low 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 when the oil
pressure drops below 7 PSI (0.48 Bar).
1. Disconnect gray wire from the oil pressure switch.
2. Ground gray wire to the engine block.
3. Turn the ignition switch to ON; the light should come
on.
4. Turn the ignition switch to OFF and connect gray
wire to the oil pressure switch.
High Coolant Temperature Light
The temperature light should come on only if the high
temperature shutdown switch and relay have stopped
the engine when the coolant temperature is from 226 to
234_F (108 to 112_C). The ignition switch must be in ei-
ther the ON or START position for the light to come on.
1. Disconnect gray wire from the high temperature
shutdown switch.
2. Ground the gray wire to the engine block.
3. Turn the ignition switch to ON; the light should come
on and the high temperature shutdown relay should
click.
4. Turn the ignition switch to OFF and connect gray
wire to the high temperature shutdown switch.
Low Water Level Light
This light comes on to warn that the coolant level in the
radiator is low enough to cause over heating of the en-
gine.
1. Disconnect electrical connector from the wire from
the coolant level sensor.
2. Ground tan wire of the connector to the vehicle
frame.
3. Turn ignition switch to ON; the light should come on.
4. Turn ignition switch to OFF and connect electrical
connector to the coolant level sensor.
Figure 46
WATER
LEVEL
BATT
(AMBER)
LOW OIL
PRESSURE
HIGH
COOLANT
TEMPERATURE
(RED)
LOW
(RED)
(RED)
FRONT OF GAUGE
GLOW
PLUG
INDICATOR
(RED)
IN
FUEL
WATER
(RED)
Battery Light
The battery light should come on when the ignition
switch is in ON with the engine not running or with an im-
properly operating charging circuit while the engine is
running.
1. Turn ignition switch to ON; the light should come on.
2. Turn ignition switch to OFF.
Water in Fuel Light
This light comes on to warn that there is sufficient water
in the fuel system to cause engine problems..
1. Disconnect electrical connector from the wire from
the water in fuel sensor.
2. Ground blue wire of the connector to the vehicle
frame.
3. Turn ignition switch to ON; the light should come on.
4. Turn ignition switch to OFF and connect electrical
connector to the water in fuel sensor.