Filter
Top Products
Indicator Lights and Circuits (GM 3000)
Note: Individual light bulbs can be tested by removing
them from the lighting cluster and applying 12 VDC to
their wiring terminals (Fig 63).
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.
LEVEL
(AMBER)
LOW OIL
PRESSURE
HIGH
COOLANT
(RED)
LOW
(RED)
(RED)
WATER
BATT
TEMPERATURE
FRONT OF GAUGE
Figure 63
3. Turn the ignition switch to ON; the light should come
on.
BACK OF GAUGE
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 245 to
255_F (118 to 124_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
A B C D E F
click.
A
B
F
E
Figure 64
4. Turn the ignition switch to OFF and connect gray
wire to the high temperature shutdown switch.
SCHEMATIC
Battery Light
B
COOLANT
TEMP
COOLANT
OIL
BATTERY
LOW
PRESSURE
C
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
E
running.
1. Turn ignition switch to ON; the light should come on.
D
2. Turn ignition switch to OFF.
F
Low Water Level Light
A
This light is not used on models with the Ford VSG–411
gasoline engine.
Figure 65
Electrical System
Page 6 – 34
Groundsmaster 3000/3000–D