Indicator Lights (Serial Numbers Above 240000000)
Charge Indicator Light
2
3
Thechargeindicatorlightshouldcomeonwhentheigni-
tion switch is in the ON position with the engine not run-
ning. Also, it should illuminate with an improperly
operating charging circuit while the engine is running.
4
1
Engine Oil Pressure Light
The engine oil pressure light should come on when the
ignition switch is in the ON position with the engine not
running. Also, it should illuminate with the engine run-
ning if the engine oil pressure drops to an unsafe level.
Figure 17
IMPORTANT: If the oil pressure indicator light is il-
luminated with the engine running, shut off the en-
gine immediately.
1.
2.
Charge indicator
Engine oil pressure
3.
4.
High temp shutdown
Glow plug indicator
5
Totesttheoilpressurelightandcircuitwiring,groundthe
wire attached to oil pressure switch located on the en-
gineneartheoilfilter.TurnignitionswitchtotheONposi-
tion; the engine oil pressure light should come on
indicating correct operation of the indicator light and cir-
cuit wiring.
2
3
4
High Temperature Warning Light
6
1
If the engine coolant temperature reaches 221oF
(105
oC) (approximate), the high temperature warning
light should come on.
Totestthehightemperaturewarninglightandcircuitwir-
ing, turn ignition switch to the ON position and ground
the gray wire attached to high temperature sender lo-
catedontheengine water pumphousing (seeTempera-
ture Sender in this Chapter). The high temperature
warning light should illuminate.
1B (--)
1A (+)
2A (+)
2
B (--)
Figure 18
Glow Plug Indicator Light
1.
2.
3.
Charge indicator
Engine oil pressure
High temperature
4.
5.
6.
Glow plug indicator
Indicator light front
Indicator light back
The glow plug light should come on when the ignition
switch is placed in the ON position prior to placing the
ignition switch in START. The light should stay lit for
approximately 6 seconds while the ignition switch is left
in the ON position.
Testing Indicator Lights
1.
2.
3.
Apply 12 VDC to terminals 1A and 2A (Fig. 18).
Ground terminals 1B and 2B (Fig. 18).
Both indicator lights should illuminate.
Electrical System (Rev. D)
Page 5 -- 14
Groundsmaster 3500--D
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