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1 Engine System Monitor Features - The appropriate light functions as follows:
A Preheat Indicator Lamp - lights up when the glow plugs, if equipped, are preheating the combustion cham-
bers. The light stays on until the preheat period is complete. The timed preheat period begins when the key
switch is turned on, and then, only when the engine is cold. On D3.6L and D4.2L models, the engine can be
started only after the light goes out.
B Charge Indicator Lamp - indicates a problem with charging system if lamp illuminates while engine is running.
Lamp will light when key switch is ON and engine is not running. When engine starts, light should go off.
C Oil Pressure Warning Lamp - indicates low engine oil pressure if lamp illuminates while engine is running.
D Coolant Temperature Warning Lamp - indicates excessive engine coolant temperature if lamp illuminates
while engine is running.
NOTE: The oil pressure warning lamp is wired in a parallel circuit with the gear lube monitor bottle switch. If lamp
illuminates while engine is running and oil pressure and oil level are normal, this may be an indication of low oil
level in the gear lube monitor bottle. The cause should be determined and corrected.
E Malfunction Indicator Lamp (MIL), D2.8L D-Tronic and D4.2L D-Tronic Only - additional lamp indicates when
a problem exists, or a malfunction has occurred, that requires service.
2 Panel Lights / Audio Test Switch - has three positions; in the normal position all electrical circuits operate
in a standard fashion (as described above). With switch toggled UP the instrumentation lights are all illuminated.
When the switch is toggled DOWN the audio warning horn will sound allowing the operator to perform a test of
the audio warning horn.
3 20 Amp Fuse and Holder - located in-line on key switch power supply wire and protects the Instrumentation
and wiring should an electrical overload occur. If an overload occurs, the fuse will burn out. Check “blown”
(burned) fuse if key is turned to RUN or START and nothing happens.
IMPORTANT: Cause for overload must be determined and corrected before attempting to install new
fuse or fuse failure will occur again.
After cause is corrected, install new fuse and check systems to function.
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