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Vanguard Single Cylinder Manual

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46
2
Fig. 33
Lighting Circuit Test (White Wire)
1. Insert RED test lead into VΩ receptacle in
meter.
2. Insert BLACK test lead into COM
receptacle.
3. Rotate selector to+))))) (DIODE TEST)
position. See Figure 9.
4. Attach RED test lead clip (A) to point (B)
of the WHITE wire (C), FIG.33. (It may be
necessary to pierce wire with a pin as
shown.)
5. Insert BLACK test lead probe (D) into
harness connector.
• If meter BEEPS once, diode is OK.
• If meter makes a CONTINOUS TONE,
diode is shorted. Replace harness.
• If meter displays OL proceed to step 6.
6. Reverse test leads.
• If meter BEEPS once, diode is installed
backwards. Replace harness.
• If meter still displays OL diode is open.
Replace harness.
NOTE: Service replacement diode harnesses
are available.
Anti-Afterfire Solenoid Test
The anti-afterfire solenoid is controlled by the
equipment key switch. With the switch OFF, the
solenoid plunger closes, stopping fuel flow
through the fixed main jet. With the switch in the
ON and START positions, the solenoid plunger
opens, allowing normal fuel flow. The solenoid is
operating properly if it clicks when the switch is
turned ON or OFF. If solenoid does not click, the
problem could be the equipment wiring, engine
wiring or the solenoid.
Afterfire can also be caused by using the afterfire
terminal of the key switch to turn the alternator
OFF when the engine is turned OFF. The
alternator continues to produce voltage and
current as long as the engine continues to turn
over, even with the key OFF. The voltage and
current continue to energize the anti-afterfire
solenoid allowing fuel to pass through the
engine, into the hot muffler, causing the afterfire.
If the equipment is wired this way, replace the 5
terminal switch with a 6 terminal switch.
Use the correct wiring diagram for the type of
alternator used.
Early solenoids were grounded through the
solenoid case.
To determine the problem, perform the following
tests in order:
NOTE: The solenoid requires 9 volts minimum
DC to function.
1. Remove solenoid from carburetor.
2. Place a jumper wire on either terminal of a
9 volt transistor battery and on one of the
pins ([B] Fig. 34) in the solenoid
connector.
3. Place another jumper wire on the
remaining pin ([B] Fig. 34) in the solenoid
connector and on the other terminal of the
battery.
Fig. 34
… 47 …


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