TP-5986 4/0330 Section 7 Generator Troubleshooting
Stator Test Procedure
1. Place the generator start/stop switch in the STOP
position.
2. Disconnect the generator set engine starting
battery, negative (--) lead first.
3. Check the generator output lead connections. See
Section 10, Wiring Diagrams and Voltage
Reconnection.
4. Disconnect all of the stator leads to isolate the
windings. To check the stator continuity, set the
ohmmeter on the R x 1 scale. Check the stator
continuity by connecting the meter leads to the
stator leads as shown in Figure 7-8. Perform the
stator tests on all the stator windings.
Note: When taking an ohmmeter reading using
lead 55, make the connection prior to the
in-line fuse.
5. Check the cold resistance of the stator windings by
connecting the meter leads to the stator leads 1-4,
2-5, 3-6, etc. See Section 1, Specifications, for the
stator resistance values.
6. Perform a megohmmeter test on the stator as
described in step 7.
Note: Consider the stator functional if the
resistance reading (continuity) is low and
there is no evidence of shorted windings
(heat discoloration).
Note: The stator resistance varies directly with
increased temperature.
If the stator readings vary considerably during the
previous checks, repair or replace the stator.
7. Check the stator for a grounded condition using a
megohmmeter. Apply 500 volts DC to any stator
lead from each winding and the stator frame.
Follow the instructions of the megohmmeter
manufacturer when performing this test. Repeat
the test on the other leads until all the stator
windings have been tested. A reading of
approximately 3--5 megohms and higher indicates
the stator is functional. A reading of less than
approximately 3--5 megohms indicates
deterioration of the winding insulation and possible
current flow to ground. Replace the stator.
Between Leads Continuity
1 and 2
3 and 4
55 and 66
B1 and B2
1 and 3, 4, 33, 44, 55
1 and 55, B1, and B2
4 and B1 and B2
55 and B1 and B2
Any stator lead and ground
Yes
Yes
Yes
Yes
No
No
No
No
No
Figure 7-8 Stator Continuity
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