SECTION CONTENTS
PAGE
20 AMP REGULATED ALTERNATOR ............................... 7-1
Alternator Output Test .............................................. 7-1
Testing DC Output Charging Wire.............................. 7-1
Testing Regulator-Rectifier.......................................... 7-2
20 AMP REGULATED ALTERNATOR
The 20 amp regulated alternator system provides AC current
through two output leads to the regulator-rectifier. The regu-
lator-rectifier converts the AC current to DC, and regulates the
current to the battery. The charging rate will vary with engine
RPM and temperature.
The stator, regulator-rectifier and flywheel are NOT inter-
changeable with any other alternator system.
WHEN CHECKING THE ALTERNATOR COMPONENTS,
MAKE THE TESTS IN THE FOLLOWING SEQUENCE:
ALTERNATOR OUTPUT TEST:
Temporarily, disconnect stator wire harness from regulator-
rectifier.
1. Insert RED test lead into receptacle in meter.
2. Insert BLACK test lead into receptacle in meter.
3. Rotate selector to (AC volts) position.
CAUTION: ATTACH METER TEST LEADS TO AC
OUTPUT TERMINALS (WHITE WIRES) BEFORE START-
ING ENGINE. IF STATOR IS GROUNDED (DEFECTIVE),
AND METER TEST LEADS CONTACT CENTER DC
OUTPUT PIN, ARCING MAY OCCUR WHICH MAY
DAMAGE WIRING.
Figure 7-1. Testing AC Output
4. Attach RED and BLACK test lead probes to AC output ter-
minals (white wires), as shown in Figure. 7-1. (Meter test
clip leads may be attached to either AC output terminal.)
5. With the engine running at 3600 RPM output should be
no less than:
26 Volts - 20 Amp System
6. If no or low output is found. check for bare wires or any
other obvious defects. If "shorted" leads are not visible,
replace the stator.
TESTING DC OUTPUT CHARGING WIRE:
A simple test may be performed to test the DC output charg-
ing wire circuit. If a problem exists in the wiring it can be
corrected before testing regulator-rectifier.
Leave stator wire harness disconnected from regulator-rec-
tifier.
Equipment keyswitch must be in OFF position.
1. Insert RED test lead into receptacle in meter.
2. Insert BLACK test lead into receptacle in meter.
3. Rotate selector to (DC volts) position.
4. Attach RED test lead probe to DC output wire terminal,
Figure 7-2.
5. Attach BLACK test lead probe to negative battery terminal.
6. Turn equipment keyswitch to ON position. Meter should
display battery voltage.
7. If meter does not display battery voltage, check for blown
fuse or broken or shorted wires.
Figure 7-2. Testing DC Output Wire
SECTION 7:
ALTERNATORS
7-1
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