Engine Run Solenoid
The engine run solenoid must be energized for the en-
gine to run. It is mounted on the engine block near the
injection pump (Fig. 29).
In Place Testing
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter will display a small resistance value (usually
1
0.5
ohms or less). This resistance is due to the internal
3
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
2
1.
Disconnect the connector from the engine run sole-
noid.
Figure 29
2.
Using a digital multimeter, touch one lead to the pin
1.
2.
Engine run solenoid
Solenoid connector
3.
Injection pump
of the black wire and the other lead to the pin of the white
wire. The resistance of the pull coil should be approxi-
mately 0.26 ohms.
2
3
3.
Using a digital multimeter, touch one lead to the pin
of the black wire and the other lead to the pin of the red
wire. The resistance of the hold coil should be approxi-
mately 10.9 ohms.
4
4.
Reconnect solenoid to the wiring harness.
Live Testing
Disconnect connector from the engine run solenoid.
1
1.
Figure 30
NOTE: The solenoid may be removed from the engine
or tested in place.
1.
2.
Engine run solenoid
Red wire (hold coil)
3.
4.
White wire (pull coil)
Black wire (common)
2.
If the solenoid is removed from the engine, make
sure that the solenoid linkage moves freely and is free
of dirt, debris, and corrosion.
3.
Connect a positive (+) test lead from a 12 VDC
source to the pins of the red and white wires.
4.
Touch a negative (−) test lead from the 12 VDC
source to the pin of the black wire. The solenoid should
engage making an audible “click”.
5.
Remove positive (+) voltage from the pin of the white
wire. The solenoid should stay engaged.
6.
Remove positive (+) voltage from the pin of the red
wire. The solenoid should release.
7.
8.
Reinstall solenoid if removed from engine.
Reconnect the harness wire connector to the sole-
noid.
Groundsmaster 4100−D
Page 5 − 19
Electrical System
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