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ALTERNATOR AND REGULATOR
8-25
Condition
Possible Cause
Correction
High regulator setting.
(a) Reset the voltage regulator according to speci-
REGULATOR CON-
TACTS BURNED
REGULATOR CON-
TACTS POINTS
STUCK
NOISY ALTERNATOR
EXCESSIVE
AMMETER
FLUCTUATION
Shorted rotor field coil windings.
fications.
cessive install a new rotor.
(b) Test the rotor field coil current draw.
If
ex-
Poor ground connection between the alternator
and the regulator. Open resistor element.
(a) Correct the ground connection. Install a new
regulator. Test the regulator setting, and reset
if necessary.
Alternator mounting loose.
(a) Properly install and tighten the alternator
Worn or frayed drive belt.
Worn bearings.
Interference between the rotor fan and stator
leads or rectifiers.
Rotor or rotor fan damaged.
Open or shorted rectifier.
Open or shorted winding in the stator.
mounting.
(b) Install a new drive belt and adiust.
(c) Remove and disassemble the alternator. Install
new bearing as required.
(d) Remove and disassemble the alternator. Cor-
rect the interference as required.
(e) Remove and disassemble the alternator. Install
a new rotor.
(f) Remove and disassemble the alternator. Test
the rectifiers. Install new rectifiers as required.
(9) Remove and disassemble the alternator. Test
the stator windings. Install a new stator
if
necessary.
(a) High resistance in the field circuit to the
(a) Clean all connections and tighten all con-
.nections as necessary. Adjust voltage regulator
alternator or an improperly set voltage
regulator.
as necessary.
ALTERNATOR
Description
The alternator (Fig. 1) is fundamentally an A.C.
current generator, with six (6) built-in silicon recti-
fiers, that convert the A.C. current into D.C. current.
D.C.
current i s available at the "output" "BAT" ter-
minal. A voltage regulator (Fig. 2) is used in the field
circuit to limit the output voltage.
The main components of the alternator are the ro-
tor, the stator, the rectifiers, the two end shields and
the drive pulley. (See Fig. 3)
HEAT SINK
GROUND BRUSH
OUTPUT TERMINAL
Fig.
1
-Alternator
Assembly
VOLTAGE REGULATOR
\
Fig. 2-Voltage
Regulator Installed flypicalj
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