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TROUBLESHOOTING & REPAIR
ROTOR VOLTAGE TEST (continued)
FIGURE F.1 - LOCATION OF LEAD 200A AND 219 FOR ROTOR VOLTAGE TEST
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TEST PROCEDURE
1.With the 5/16” and 3/8” nut driver, remove the sheet metal screws from the right hand case side.
2.Carefully remove the right case side.
3.Set the volt/ohmmeter to the DC volts position.
4.Connect the positive meter probe to the brush nearest the rotor lamination (lead #200A). See Figure F.1 for location.
5.Connect the negative meter probe to the other brush (lead #219).
6.Start the engine and run it at high idle (3700 RPM). Set the output control to the MAXI- MUM position (position 10).
7.Check the voltage reading on the voltmeter. It should read between 37 and 47 VDC.
8.If the voltage reading is low or not present, the generator field is not functioning prop- erly. Perform the Rotor Resistance Test. The field diode bridge (D2), the field capac- itor (C2), and/or the control board may be faulty.
9.If the voltage reading is normal, the field circuit is functioning properly. Install the right case side with the sheet metal screws and the 5/16” and 3/8” nut drivers.
RANGER
