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Engine Oil Pressure Indicator Light
The engine oil pressure indicator light is located on the
handle control panel (Fig. 10). The indicator 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 if the engine oil pressure is insufficient.
IMPORTANT: If the engine oil pressure indicator
light comes on when the engine is running, shut en-
gine off immediately.
Testing
1. Turn the ignition switch to ON. The engine oil pres-
sure indicator light should be on.
2. If the light is not on, locate the oil pressure switch on
the engine and disconnect the wire from the switch.
Figure 10
Ground the disconnected wire to the engine block.
1. Oil pressure indicator light
3. If the light comes on, the oil pressure switch is faulty.
4. If the light does not come on, check the indicator light
and indicating circuit (see Electrical Schematic in Chap-
ter 8 – Electrical Diagrams).
Testing Indicator Light
1. Apply 12 VDC to terminal 1A (Fig. 11).
Figure 11
1A (+)
1B (–)
BACK OF INDICATOR LIGHT
2. Ground terminal 1B (Fig. 11).
3. Indicator light should illuminate.
NOTE: For engine oil pressure switch information, refer
to the Kohler Engine Service Manual at the end of Chap-
ter 3 – Engine.
Hour Meter
The hour meter used on the ProCore 648 uses an induc-
tive pickup wire connected to the rear spark plug wire to
sense when the engine is running. The hour meter
should increase 1/10 of an hour every six (6) minutes of
engine running time.
The hour meter uses its own internal battery and there-
fore, is not connected to the ProCore 12 volt electrical
system. The hour meter battery is not replaceable.
1
Figure 12
1. Hour meter
Electrical System
Page 5 – 14
ProCore 648