Engine Run Solenoid
The engine run solenoid must be energized for the en-
ginetorun.Thesolenoidismountedontheengineblock
near the injection pump.
2
In Place Testing
1
3
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
0.5
ohms or less). This resistance is due to the internal
resistance of the meter and test leads. Subtract this val-
ue from from the measured value of the component you
are testing.
1.
noid.
Disconnect the connector from the engine run sole-
Figure 27
1.
2.
Engine run solenoid
Solenoid connector
3.
Injection pump
2.
Using a digital multimeter, touch one lead to the pin
oftheblackwire andthe otherlead tothe pinofthewhite
wire. The resistance ofthe pull coil should be about 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 about
4
10.9
ohms.
4.
Connect solenoid to the wiring harness.
Live Testing
Disconnect connector from the engine run solenoid.
1
Figure 28
1.
1.
2.
Engine run solenoid
Red wire (hold coil)
3.
4.
White wire (pull coil)
Black wire (common)
NOTE: The solenoid may be removed from the engine
or tested in place.
2.
sure that the solenoid linkage moves freely and is free
of dirt, debris, and corrosion.
If the solenoid is removed from the engine, make
3.
source to the pins of the red and white wires.
Connect a positive (+) test lead from a 12 VDC
4.
source to the pin of the black wire. The solenoid should
engage making an audible “click”.
Touch a negative (--) test lead from the 12 VDC
5.
wire. The solenoid should stay engaged.
Remove positive (+) voltage from the pin of the white
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.
Electrical System (Rev. A)
Page 5 -- 18
Groundsmaster 4500--D/4700--D
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