Tri-Circuit Alternator - Vanguard OHV V-Twin User Manual

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) will be displayed as OL.
1. Insert RED test lead into VW receptacle in meter.
2. Insert BLACK test lead into COM receptacle in
meter.
3. Rotate selector to + )) (DIODE TEST) position.
)
)
)
4. Attach RED test lead clip (1) to point A and
BLACK test lead clip (2) to DC output pin (6),
Fig. 17. (It may be necessary to pierce wire with
a pin as shown.)
a. If meter BEEPS once, diode is OK.
b. If meter makes a CONTINUOUS TONE,
diode is 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 grounded leads are not
visible, replace the stator.
NOTE: Service replacement diode harnesses are
available. Use resin core solder when
installing new harness. Use shrink tubing or
tape all connections. DO NOT USE CRIMP
CONNECTORS.
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A
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Fig. 17
38
AC Output Test
1. Insert RED test lead into VW receptacle in meter.
2. Insert BLACK test lead into COM receptacle.
3. Rotate selector to V~ (AC VOLTS) position.
4. Attach RED test lead clip (1) to AC output
terminal (5), Fig. 18.
5. Attach BLACK test lead clip (2) to engine
ground.
6. With engine running at 3600 RPM output should
be no less than 14 volts AC.
7. If NO or LOW output is found, replace stator.
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Fig. 18

Tri-Circuit Alternator

The tri-circuit alternator provides alternating current
(AC) through a single output lead and connector to
a wiring harness containing two diodes.
One diode rectifies the AC current to 5 amps
NEGATIVE (-) DC for lights. The second diode
rectifies the AC current to 5 amps POSITIVE (+) DC
for battery charging and external loads, such as an
electric clutch.
NOTE: Some original equipment manufacturers
(OEMs) supply diodes as an integral part of
the equipment wiring harness. Some OEMs
use a 1 Ohm-20 Watt resistor placed in
series with (+) DC charging lead, limiting the
charging current to approximately 3 amps
when the clutch is not engaged. When the
clutch is engaged the resistor is bypassed
allowing full output to the battery and clutch.
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