2
36
DC Alternator
The DC alternator provides DC current for charging
a 12 volt battery. The current from the alternator is
unregulated and is rated at
3 amps
. The output rises
from
2 amps @ 2400 RPM
, to
3 amps @ 3600 RPM
.
1. Stator assembly (1),
Fig. 12
.
2. One RED lead from stator (2).
3. DIODE encased at connector (3).
4. RED connector output lead (4).
Fig. 12
Output Test
NOTE:
The battery MUST be in good condition to
perform this test.
WHEN CHECKING ALTERNATOR COM-
PONENTS, PERFORM THE TEST IN THE
FOLLOWING SEQUENCE:
1. Insert RED test lead into
10A
receptacle in
meter.
2. Insert BLACK test lead into
COM
receptacle.
3. Rotate selector to
A==
(DC amps) position.
4. Attach RED test lead clip (1) to DC output
terminal,
Fig. 13
.
5. Attach BLACK test lead clip to POSITIVE (+)
battery terminal (2).
6. With engine running at
3600 RPM
, output should
be
2 - 4 amps
DC.
NOTE:
The output will vary with the battery voltage.
If the battery is at maximum voltage the out-
put will be approximately 2 amps.
7. If
NO
or
LOW
output is found, test diode.
ÌÌ
ÌÌ
Ì
Fig. 13
Diode Test
In the DIODE TEST position, the meter will display
the forward voltage drop across the diode(s). If the
voltage drop is
less than 0.7 volts
, the meter will
BEEP once and display the voltage drop. A
CONTINUOUS TONE
indicates CONTINUITY
(shorted diode). An INCOMPLETE CIRCUIT (open
diode) is displayed as
OL
.
1. Insert RED test lead (1) into
V
receptacle in
meter.
2. Insert BLACK test lead (2) into
COM
receptacle
in meter.
3. Rotate selector to
+
)
)
)
))
(DIODE TEST) position.
4. Attach RED test lead clip to point A and BLACK
test lead clip to the stator output lead (3),
Fig. 14
.
(It may be necessary to pierce the wire with a pin
as shown.)
a. If meter
BEEPS once
, diode is OK.
b. If meter makes a
CONTINUOUS TONE
,
diode is defective (shorted). Replace diode.
c. If meter displays
OL
proceed to step 5.
5. Reverse test leads.
a. If meter
BEEPS once
, diode is installed
backwards. Replace diode.
b. If meter still displays
OL
, diode is open.
Replace diode.
6. If diode tests OK, check stator for bare wires or
other obvious defects. If bad or grounded leads
are not visible, replace the stator.
