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217
Tests
Test 16: Generator End Troubleshooting (Page 2 of 3)
B: Main Stator Test
C: Voltage Regulator Test
1. Turn off the
main circuit breaker.
2. Remove the 4 screws from the top of the generator cover with an 8mm wrench.
3. Remove the white and green wires from T2.
4. Connect one lead to a grounding bolt and the other to one of the output terminals. Check resistance
for all output terminals. The meter should show an open or extremely high resistance (more than
100kΩ or OL). This means the main stator winding is good. If there appears to be a short between
any one of the output terminals and the generator housing, the main stator has shorted and the
generator end needs to be replaced.
1. Disconnect the F(+) wire and the F(-) wire from the voltage regulator and connect them to a separate
12 V or 24 V battery.
2. Connect an AC volt meter to output terminal T1/L1 and T4/L2.
3. Leave the main
circuit breaker on but turn off the rest of the breakers in panel 1.
4. Turn on the engine, verify RPM is ±4% of 1800. Check the output voltage. If output voltage is ≥215 V,
the generator end is good and the voltage regulator should be replaced.
*Voltage regulator can be model 440 or 460
Use a flat head
screwdriver to
adjust voltage
1
1
2
2
3
3
Burner Service
Outlet
Feed
Pump
Circulation
Pump
Fan
Motor
4
4