Briggs & Stratton 273521, 271172 manual Amp DC Regulated Alternator, Notice, Test Alternator Output

20 Amp DC Regulated Alternator

The 20 Amp regulated alternator system provides AC current through two output leads to 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.

Test Alternator Output

1.Temporarily disconnect stator wire harness from regulator-rectifier.

2.Insert RED test lead into V Ω receptacle in meter.

3.Insert BLACK test lead into COM receptacle.

4.Rotate selector to AC Volts position.

NOTICE

Attach meter test leads to the AC output terminals (yellow wires) in the connector BEFORE starting the engine. If the stator is grounded (defective) and the meter test leads contact the center DC output pin (red wire) in the connector, arcing could occur, damaging the wire.

5.Attach red (A, Figure 31) and black (B) test lead probes to the yellow wire (C) AC output terminals (D), of the connector (F).

Figure 31

6.If No or Low output is found, check for bare wires or other defects. If shorted leads are not visible, replace the stator.

7.With the engine running at 3600 rpm, output should be no less than 26 volts.

DC Output Charging Wire Test

A simple test can be used to test the DC output charging wire circuit. If a wiring problem exists, it can be corrected before testing the regulator- rectifier.

1.Leave stator wire harness disconnected from the regulator-rectifier.

2.Equipment key switch must be in OFF position.

3.Insert RED test lead into V Ω receptacle in meter.

4.Insert BLACK test lead into COM receptacle.

5.Rotate selector to DC Volts position.

6.Attach red test lead probe (A, Figure 31) to the red wire (G) DC output terminal (E) of the connector.

7.Attach black test lead probe (B) to negative battery terminal.

8.Turn equipment key switch to ON position. Meter should display Battery Voltage.

9.If meter does not display battery voltage, check for blown fuse or broken or shorted wires.

Regulator-Rectifier Test

The DC Shunt #19359 must be installed on the negative (-) battery terminal to avoid blowing the fuse in the meter when testing the output of the 20 amp system. All connections must be clean and tight for correct readings.

1.Connect stator wire harness to regulator- rectifier.

2.Install DC Shunt #19359 (D, Figure 32) on negative (-) battery terminal.

3.Insert RED test lead (A) into V Ω receptacle in meter and connect to red post terminal on shunt (E).

4.Insert BLACK test lead (B) into COM receptacle in meter and connect to black post on shunt (C).

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