Table 4-3. Organizational Troubleshooting
TEST OR INSPECTION
5. GENERATOR FAILS TO BUILD UP RATED VOLTAGE
Check for loose, cut, broken, and worn wiring.
If connections are loose, tighten them. If wiring is damaged, repair it. Refer to paragraph 4-39
for repair instructions.
Check for a broken or cracked voltage selector switch.
Check for damaged wiring.
If the voltage selector switch is damaged or defective, refer to paragraph 4-37 for removal and
Inspect the variable resistor for cracks, corrosion, loose connections and other damage. Test the
variable resistor as follows:
a. Stop the generator set and disconnect terminal 26 of the voltage regulator terminal board.
b. With a multimeter, check resistance across the variable resistor terminals by varying the
resistor from full counterclockwise to full clockwise position. This reading should move smoothly
from 0 to 750 ohms ± 10% as the variable resistor is rotated to the full clockwise position.
On sets manufactured prior to 1968, this reading will be 0 to 250 ohms ± 10%.
Replace the variable resistor (para 4-16) if the reading is not within specifications.
Check the voltage regulator for loose wires, corrosion, metal to metal contact, or incorrect wiring.
6. VOLTMETER READING TOO HIGH OR TOO LOW
Check for a broken or cracked voltage adjusting rheostat switch. Inspect for broken wiring or
loose connections around the switch.
If voltage adjusting rheostat switch is damaged or defective, refer to paragraph 4-38 for
removal and installation instructions.
Check for broken or cracked voltmeter. Inspect for broken wiring or loose connections. Test
voltmeter by connecting an additional voltmeter to load terminals of generator set and taking
comparative readings to estblish validity of generator set voltmeter.
If voltmeter is damaged or defective, refer to paragraph 4-33 for removal and installation
7. NO POWER AVAILABLE AT OUTLET RECEPTACLE (MODEL MEP-017A)
Check for loose connections by visually observing or by grasping wires and tugging slightly.
Also, check for broken or worn wiring.
If damage or loose connections are found, refer to paragraph 4-39 for repair instructions. If
there are no loose connections or damaged wiring, go on to step 2.
Check for cracked or broken outlet receptacle.
If receptacle is damaged, refer to paragraph 4-43 for removal and installation instructions.