ROD AS 5597588 - Caterpillar

Procedure A - Check Engine RPM (Frequency)
Procedure B - Adjust Voltage Level
The voltage level adjustment range must be within +10 to -25% of rated voltage.* If the voltage level cannot be adjusted as described: a. Check accuracy of voltmeter.b. Go to Procedure C.Procedure C - Check Fuses Located On Regulator
* If fuse(s) have failed: Look for possible short circuits that could cause fuse failure such as shorted exciter stator L1, etc.* If fuse(s) are okay: Go to Procedure D.Procedure D - Check Connections To Regulator
* If connections are correct: Go to Procedure E.Procedure E - Isolate Attachments
Disconnect attachments such as manual voltage control, etc. Operate at rated rpm. If remote mounted voltage adjustment is disconnected, connect jumper across terminals 4 and 7.* If generator output voltage is normal: Check attachments.* If voltage cannot be adjusted to rated voltage at rated frequency: a. Replace regulator.b. Bench test the regulator; see Bench Test.