TM 9-2350-230-12
Malfunction
Probable cause
Corrective action
HULL ELECTRICAL SYSTEM -
Continued
42. Generating system
a. Loose cable connectors, or
a. Inspect and tighten loose
inoperative (voltage,
improper connections
cable connectors.
measured at bat-
teries, below 26.0
b. Defective generator-to-
b. Check harness continuity and
volts with engine
voltage regulator harness
resistance (Table 8-7 and
operating and all
accessories off).
c. Defective generator drive
c. Check generator drive com-
belts, pulleys, gear box, or
ponents (figs. 9-109, 9-111,
tensioner
d. Failsafe circuit in voltage
d. See voltage regulator fail safe
regulator locked out,
circuit, ( table 8-7).
e. Loss of generator residual
e. Polarize generator (fig. 9-111:
magnetism.
f. Regulator faulty
f. Check generator (table 8-7).
Replace regulator if no
fault can be found in genera-
tor, cables, or in a through
e above.
g. Generator faulty
g. Generator may pass ohmeter
test and still be faulty. If
regulator is known to be
good, replace generator.
42. 1. Voltage measured
Voltage regulator out of adjust-
Adjust voltage regulator
at batteries is
ment
above 26 volts
but not in accord-
ance with table in
figure 9-110 (with
engine running
and all acces-
sories off).
42. 2. Generator "Motors'
a. Engine fuel shutoff out of
a. Disconnect battery-to-voltage
engine on shut-
adjustment
regulator harness. If
down
engine continues to run,
problem is in fuel shutoff
NOTE If generator
system (fig. 9-23).
drive belts are broken,
generator will motor until
b. Voltage regulator faulty
b. If engine stops when battery-
battery-to-regulator cir-
to-regulator harness is dis-
cuit is opened. This is
connected, voltage regulator
normal unless motoring
is faulty. Check for fused
resumes when batteries
relay in voltage regulator
are reconnected.
(Table 8-7). If relay is
fused, check entire vehicle
and correct short circuit
which caused relay to fuse.
8-23
