5 & 9 Amp Dc Regulated Alternator - Briggs & Stratton 276781 Instruction Manual

2. Insert BLACK test lead (B) into the COM
receptacle in the meter.
3. Attach RED test lead clip to (D) of the
WHITE wire (C). (It may be necessary to
pierce wire with a pin as shown.)
4. Insert BLACK test lead (B) into harness
connector.
2
2
Figure 25
• If meter "Beeps" once, diode is OK.
• If meter makes a continuous tone, diode
is defective (shorted).
• If meter displays "OL," proceed to Step 4.
5. Reverse test leads.
• If meter "Beeps" once, diode is installed
backwards.
• If meter still displays "OL," diode is
defective (open).
6. If diode tests OK, replace stator.
5 & 9 Amp DC Regulated Alternator
The 5 & 9 Amp regulated alternator systems
provide AC current through a single lead into the
regulator-rectifier. The regulator-rectifier
converts the AC current to DC and regulates
current to the battery. The charging rate will vary
with engine RPM and temperature.
Alternator output is determined by the flywheel
alternator magnet size. The stator and regulator-
rectifier are the same for the 5 & 9 Amp
regulated system and the Tri-Circuit System.
38
Test Alternator Output
1. Temporarily disconnect stator wire
harness from the regulator-rectifier.
2. Insert RED test lead (A, Figure 26) into the
V Ω receptacle in the meter.
3. Insert BLACK test lead (B) into COM
receptacle.
4. Rotate selector to AC Volts position.
5. Attach RED test lead clip to GREEN
output terminal (C).
6. Attach BLACK test lead clip to engine
ground.
Figure 26
7. With engine running at 3600 RPM, AC
output should be no less than:
• 28 Volts AC - 5 Amp System
• 40 Volts AC - 9 Amp System
8. If NO or LOW output is found, replace the
stator.
Test Regulator-Rectifier
NOTE: The regulator-rectifier will not function
unless it is grounded to engine. Make sure the
regulator-rectifier is securely mounted to the
engine. When testing regulator-rectifier
amperage output, a 12 Volt battery with a
minimum charge of 5 Volts is required. There will
be no output if battery voltage is below 5 Volts.
NOTICE: Connect test leads BEFORE starting
the engine. Be sure connections are secure. If a
test lead vibrates loose while engine is running,
the regulator-rectifier may be damaged.