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 TM 9-2815-220-24
GENERATOR ABNORMAL OPERATION (650 AMPERE)
0021 00
MALFUNCTION 2: (Continued)
Undercharging (maximum indicator reading in "yellow" during vehicle operation.
PROBABLE CAUSE
CORRECTIVE ACTION
c. Voltage regulator defective.
(1) Inspect voltage regulator and replace if
necessary (refer to pertinent vehicle
technical manual).
d. Generator drive gear assembly failure..
(1) Perform functionality check as follows:
PROCEDURE
OBSERVATION
ANALYSIS
Remove 1/8-inch pipe plug
located in center of end plate
and install 200 psi gauge.
Oil pressure 100 10 psi. Generator oil pump operation is
Start and warm up engine at
normal, the generator is rotating
idle speed (675-725 rpm) to
and the drive coupling is
operating temperature
(140 F).
functioning.
Generator oil pump failed, and/or
Oil pressure same as
generator not rotating, and/or
normal engine gallery
drive coupling failed. Go to next
pressure (15-25 psi).
step.
PROBABLE CAUSE
CORRECTIVE ACTION
d. (Continued) Failed generator drive gear
(2) Check slip torque of drive coupling
assembly.
assembly (WP 0039)
(3) If drive coupling is OK and generator failed
functionality test, replace generator
(WP-0051, Generator Replacement - 650
Ampere).
MALFUNCTION 3:
Overcharging (indicator reads right "red").
PROBABLE CAUSE
CORRECTIVE ACTION
a. Loose or corroded battery terminals, or
(1) Inspect, clean, tighten, or repair as
grounded cables.
necessary (refer to pertinent vehicle
technical manual).
b. Defective batteries.
(1) Check individual battery cells. Replace
defective batteries (refer to pertinent vehicle
technical manual).
c. Voltage regulator defective.
(1) Inspect voltage regulator and replace if
necessary (refer to pertinent vehicle
technical manual).
WP 0021 00-3
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