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Rev. B
Workman MD/MDXPage 6 -- 14Electrical System
Starter/Generator
Testing of starter/generator field and armature windings
is difficult with the starter/generator still mounted in the
Workman. Follow the procedures for Starter Generator
& Voltage Regulator Component Testing prior to remov-
ing the starter generator for further testing and repairs.
Starter generator resistance tests are as follows:
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 the measured value of the component you are
testing.
1. Disconnect wire connections on starter/generator to
separate circuits.
2. If starter/generator is a Valeo brand (identified by Va-
leo on commutator end cover of starter/generator and
through bolts that are in--set from outer diameter of end
cover) (Fig. 16):
A. Measure resistance (Ohms) between starter
generator terminals DF and F1 (field). The meter
readingshouldbe5.5to5.9Ohms.
B. Measure resistance (Ohms) between starter
generator terminals A1 and A2 (armature). The me-
ter reading s hould be under 1 Ohm (but not zero).
C. Measure resistance between each terminal and
ground. The meter reading should be infinite (no
continuity).
3. If starter/generator is a Advanced Motor and Drives
brand (identified by through bolts that are near the outer
diameter of commutator end cover) (Fig. 17):
A. Measure resistance (Ohms) between starter
generator terminals F1 and F2. The meter reading
should be very low (approximately 0.006 Ohms).
B. Measure resistance (Ohms) between starter
generator terminals DF and F1. The meter reading
should be approximately 3 to 6 Ohms.
C. Measure resistance between each terminal and
ground. The meter reading should be infinite (no
continuity).
4. Starter/generator disassembly and repair will be
needed if readings are incorrect (see Starter/Generator
ServiceintheServiceandRepairssectionofthischap-
ter).
Figure 16
F2
F1
DF
1. Valeo Starter/Generator end cover view
2. Through bolt (2 used)
1
2
2
Figure 17
1
1. Advanced Motors Starter/Generator end cover view
2. Through bolt (2 used)
F2
F1
DF
2
2