Briggs & Stratton 271172 manual Test Alternator Output, Test Diode, Charging Circuit Test RED Wire

resistor is bypassed allowing full output to the battery and clutch.

The battery is not used for the lights, so lights are available even if the battery is disconnected or removed. Current for the lights is available when the engine is running. The output varies, so the brightness of the lights changes with engine speed.

Test Alternator Output

1.Insert RED test lead (A, Figure 23) into the V Ω receptacle in the meter.

2.Insert BLACK test lead (B) into COM receptacle.

3.Rotate selector to AC Volts position.

4.Attach RED test lead clip to AC output terminal (C).

5.Attach BLACK test lead clip to engine ground.

Figure 23

6.With engine running at 3600 RPM, AC output should be no less than 28 Volts.

•If NO or LOW output is found, replace the stator.

•If alternator output is good, test the diodes in the wiring harness.

Test Diode

One diode is for the charging circuit, the other diode is for the lighting circuit.

In the Diode Test position, the meter will display forward voltage drop across the diode(s). If voltage drop is less than 0.7 volts, meter will

“Beep” once as well as display voltage drop. A continuous tone indicates continuity (shorted diode). An incomplete circuit (open diode) will be displayed as “OL.”

Charging Circuit Test (RED Wire)

1.Insert RED test lead (A, Figure 24) into the V Ω receptacle and set the rotary switch to Diode position.

2.Insert BLACK test lead (B) into the COM

receptacle in the meter. 2

3.Attach BLACK test lead clip to (C) of the RED wire (D). (It may be necessary to pierce wire with a pin as shown.)

4.Insert RED test lead (A) into harness connector.

Figure 24

•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.

Lighting Circuit Test (WHITE Wire)

1.Insert RED test lead (A, Figure 25) into the V Ω receptacle and set the rotary switch to Diode position.

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