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Vanguard Single Cylinder Manual

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2
If meter still displays OL:
• Diode is open.
• Replace the diode.
4. If diode tests OK, check stator for bare
wires or other obvious defects. If
grounded leads are not visible, replace
the stator.
Fig. 28
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 AC Output Test
1. Set meter. See Figure 5.
2. Attach RED test lead clip to AC output
terminal ([G] Fig. 29).
Fig. 29
3. Attach BLACK test lead clip to engine
ground.
4. Start engine.
Output should be no less than 14 volts AC @
3600 RPM.
If no or low output is found:
• Replace stator.
Tri–Circuit Alternator
The tri–circuit alternator provides AC through a
single output lead and connector ([B] Fig. 29) to
a wiring harness containing two diodes (C). One
diode rectifies the AC to 5 amps negative (-) DC
for lights (D). The second diode rectifies the AC
to 5 amps positive (+) DC for battery charging
and external loads ([E] Fig. 30).
Fig. 30
NOTE: Some equipment manufacturers supply
the diodes as an integral part of the equipment
wiring harness.
A 1 ohm 20 watt resistor (supplied by OEM) ([A]
Fig. 76) is placed in series with the (+) 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. Since the alternator powers
the lights, the lights are available even if the
battery is disconnected or removed. Current for
the lights is available as long as the engine is
running. The output depends upon engine RPM,
so the intensity of the lights changes with engine
speed.
… 45 …


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