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Workman MDX--D Electrical SystemPage 5 -- 9
Indicator Lights
Charge Indicator Light
The charge indicator light should comeon whentheigni-
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.
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.
IMPORTANT: If the oil pressure indicator light is il-
luminated with the engine running, shut off the en-
gine immediately.
To testtheoil pressurelightand circuit wiring, groundthe
wire attached to oil pressure switch located on the en-
gine near the oilfilter. Turnignition switchto the ONposi-
tion; the engine oil pressure light should come on
indicating correct operation of the indicator light and cir-
cuit wiring.
Engine Temperature Light
If the engine coolant temperature reaches 230
o
F
(110
o
C) (approximate), theengine temperature light will
come on.
To test the engine temperature light and circuit wiring,
turn ignition switch to the ON position and ground the
wire attached to over temperature switch located on the
engine water pump housing (see Over Temperature
Switch in this section). The engine temperature light
should illuminate while the wire is grounded.
Glow Plug Indicator Light
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 six (6) seconds while the ignition switch
is left in the ON position.
Testing Indicato r Lights
1. Apply 12 VDC to indicator light terminals 1A and 2A
(Fig. 9).
2. Ground indicator light terminals 1B and 2B (Fig. 9).
3. Both indicator lights should illuminate.
1. Charge Indicator
2. Engine oil pressure
3. Engine temperature
4. Glow plug indicator
Figure 8
3
2
1
4
Figure 9
1. Charge indicator
2. Engine oil pressure
3. Engine temperature
4. Glow plug indicator
5. Indicator light front
6. Indicator light back
1A (+)
2A (+)2B (--)
1B (--)
4
3
5
2
1
6
Electrical
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