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Flywheel Identification
OHV single cylinder flywheels have a single ring
of magnets which provide the magnetic field for
the various alternator systems, except Model
Series 97700, 99700, 121600, 126000 which use
the magneto magnet. There are two sizes of
flywheel magnets. The size of the magnet
determines alternator output.
The following table identifies the magnet size to
be used with a specific alternator system.
NOTICE: Do not use large-magnet flywheels
with AC-only, DC-only, or Dual Circuit
Alternators.
• Small Magnet - Approx. 28/32” x 21/32”
(22mm x 17mm).
• Large Magnet - Approx. 1-3/32” x 29/32”
(28mm x 23mm).
Testing Alternator Output
The following alternator test procedures were
developed using the Fluke® Digital Multimeter.
When performing alternator tests with the
UNI-T® Digital Multimeter, refer to the operating
manual supplied with that meter for the proper
procedure.
All test values will be the same regardless the
meter used.
NOTE: Before testing alternator output, use an
accurate tachometer to temporarily adjust the
engine speed to the RPM specified in the test
instructions.
When testing alternators, perform the tests in the
following sequence:
1. Test alternator output.
2. Test diode(s) or regulator-rectifier (if
equipped).
.5 Amp DC Only Alternator
The .5 Amp, DC alternator is designed to operate
as an integral part of the engine and is separate
from the starting and ignition system. It is
intended to provide DC charging current for a 12
Volt battery. Contact battery or equipment
manufacturer for battery information.
Test Alternator Output
Disconnect charging lead to battery at connector.
1. Insert RED test lead into 10 Amp
receptacle in meter.
2. Insert BLACK test lead into COM
receptacle in meter.
3. Rotate selector to DC Amps position.
4. Attach RED test clip to output terminal
(A, Figure 16).
5. Attach BLACK test clip to charging lead
(B) that was disconnected at the
connector.
Figure 16
6. With engine running at 2800 RPM, output
should be no less than .5 Amp DC.
7. If low or no output, check stator air gap.
8. If stator air gap is within specification and
there is low or no output, replace stator.
3-Amp DC Only Alternator
The DC alternator provides DC current for
charging a 12 Volt battery. Current from the
alternator is unregulated and is rated at 3 Amps.
The output rises from 2 Amps at 2400 RPM to 3
Amps at 3600 RPM.
Test Alternator Output
1. Insert RED test lead (A, Figure 17) into 10
Amp receptacle in meter.
2. Insert BLACK test lead (B) into COM
receptacle in meter.
3. Rotate selector to DC Amps position.
4. Attach RED test lead clip to DC output
terminal connector (C).