Dual Circuit Alternator - Vanguard OHV V-Twin User Manual

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Fig. 14
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.

Dual Circuit Alternator

Dual circuit alternators use a polarized plug with two
pins. One pin provides DC current for charging the
battery, the second pin is an independent AC circuit
for headlights.
Current for lights is available when the engine is
running. The output varies with engine speed, so
brightness of the lights changes with engine speed.
12 volt lights with a total rating of 60 to 100 watts
may be used. With lights rated at 70 watts, the
voltage rises from 8 volts @ 2400 RPM to 12 volts
at 3600 RPM. Since the battery is not used for the
lights, the lights are available even if the battery is
disconnected or removed.
Current from the DC side of 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. 15.
2. RED lead from stator (2), DC output for charging
battery.
3. BLACK lead from stator (3), AC output for
lighting circuit.
4. DIODE encased at connector (4).
5. WHITE lead (5) for AC lighting circuit.
6. RED lead (6) for DC charging circuit.

A
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DC Output Test
NOTE: The battery MUST be in good condition to
1. Insert RED test lead into 10A receptacle in meter.
2. Insert BLACK test lead into COM receptacle in
3. Rotate selector to A== (DC AMPS) position.
4. Attach RED test lead clip (1) to DC output pin (6)
NOTE: The raised rib on the connector or the RED
5. Attach BLACK test lead clip (2) to POSITIVE (+)
6. With engine running at 3600 RPM output should
NOTE: The output will vary with the battery voltage.
7. If NO or LOW output is found, test diode.
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Fig. 15
perform this test.
meter.
in connector (4), Fig. 16.
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Ì Ì Ì
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Fig. 16
wire (3) indicates the DC output pin side.
The AC pin (5) is not used for this test.
battery terminal.
be between 2 - 4 amps DC.
At maximum battery voltage the output will
be approximately 2 amps.
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