Table 2-9. Electrical System Troubleshooting
TEST OR INSPECTION
1. ONE OR MORE AC RECEPTACLES ARE INOPERABLE.
Start generator (TM 9-4940-568-10). Ensure main AC circuit breaker (1) is ON. Check circuit breaker #7 (2) in
120/208 VAC control panel (3) is not tripped.
Reset circuit breaker #7. If circuit breaker #7 will not reset, go to next test.
Shut down generator (TM 9-4940-568-10). Remove receptacle cover plate and receptacle housing (Para 3-9).
Tag and mark all wires prior to removal. The following must be performed on both
Remove wires from receptacle. Check for continuity across terminals of receptacle. If
there is no continuity across terminals, replace receptacle (Para 3-9). If continuity is
found on both terminals, go to next step.
Remove circuit breaker #9 from 120/208 VAC control panel (Para 3-4).
Remove black wire from terminal and check for continuity on black wire from 120/208
VAC control panel box to black wire at receptacle. If no continuity is found, repair or
replace black wire (see schematic Figure 2-4). If continuity is found, Notify Supervi-