Troubleshooting GP Repair
wc_tx000548gb.fm 88
6.15 Checking Excitation Winding
See Graphic: wc_gr003127
The excitation winding provides AC voltage to the Automatic Voltage
Regulator (AVR). The AVR then sends a DC voltage through the rotor
winding “exciting” the rotor into becoming an electromagnet. To check
the excitation winding, carry out the following procedures:
6.15.1 Stop the engine.
6.15.2 Remove the two screws which secure the end cover to the generator
and remove the end cover.
6.15.3 Remove the plug (a) which connects the excitation winding to with the
AVR. On GP 2500A models, remove plug (b).
6.15.4 Using the Ohms scale on your multimeter, check the resistance of the
excitation winding. Access the excitation winding via the connector
where the two yellow wires of the plug connect to it. Each generator
size will have a different value for the winding resistance. Check the
chart in the graphic for the correct values—use a tolerance of +0.5/-0.0
Ohm.
• If the correct amount of resistance was measured, the excitation
winding is OK.
• If the correct amount of resistance was not measured, replace
the stator.
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