Main and Accessories Contactors
Two contactors (solenoids) are used on the Workman
MDE for circuit control.
5
4
1
The main contactor provides current to the vehicle con-
troller and is energized when the on/off switch is ON.
The main contactor is located under the controller cover
beneath the cargo box (Fig. 30).
2
Theaccessories contactor provides currenttothehead-
lights, horn and optional electrical accessories. The ac-
cessories contactor is energized when the on/off switch
isON.Theaccessories contactor islocated beneath the
dash panel.
3
6
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
Figure 30
1.
2.
3.
Main contactor
4.
Fuse (F1)
Positive battery cable
Isolator
Cable to controller B+
Wire harness connector
5.
6.
0.5
ohms or less) that is due to the internal resistance of
the meter and test leads. Subtract this value from the
measured value of the component you are testing.
1
1.
Make sure on/offswitch is turned OFF.Open the bat-
tery circuit by removing one of the battery cables (see
Opening Battery Circuit in the General Information sec-
tion of this chapter and Fig. 31).
2
A
2.
Locate contactor that is to be tested. Disconnect all
vehicle harness electrical connections from contactor.
Note wire connector locations on contactor for reas-
sembly purposes.
4
3.
Usingjumperwires,apply48VDCdirectlyacrossthe
Figure 31
contactorcoilposts(Fig.32).Thecontactorshouldclick.
With the contactor coil energized, resistance across the
main contact posts should be less than 1 ohm.
1.
Negative cable to vehicle
2.
Positive cable to vehicle
4
4.
Remove voltage from contactor coil posts. The con-
tactorshouldclick.Withthecontactorcoilnotenergized,
resistance across themaincontact posts should be infi-
nite ohms.
4
2
3
5.
(Fig. 32):
Measure resistance across the contactor coil posts
3
3
A. For the main contactor, the resistance should be
approximately 126 ohms.
4
4
B. For the accessories contactor, the resistance
should be approximately 200 ohms.
1
3
Figure 32
1.
2.
Main contactor
Accessories contactor
3.
4.
Main contact posts
Contactor coil posts
Electrical System
Workman MDE
Page 3 -- 20
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