40 Amp Charging System; Test Equipment; Test Alternator-Dc Output; Disassemble Alternator - Briggs & Stratton Vanguard 430000 User Manual

40 Amp Charging System

The 40 Amp charging system consists of a belt
driven, internally regulated alternator (Figure 17).
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Figure 17
The alternator contains a charge light circuit ("L"
terminal). With the keyswitch in the ON position and
the engine not running the charge indicator light
should light. With the engine running the light
should go out, indicating that the battery is being
charged.
If the charge indicator light does not light when the
keyswitch is in the ON position (engine not running),
check the bulb and wiring.
• A loose V-belt will cause low AC output.
• Belt deflection limit is 3/8-1/2in./22lb.
(10.0-12.0 mm/10 kg).

Test Equipment

The Digital Multimeter #19390 and the DC Shunt
#19468, are required to test the charging system.
NOTE: The digital multimeter will withstand DC
input of 10-20 amps for up to 30 seconds. To avoid
blowing the fuse in the meter, the DC shunt is
required.
Test Alternator - DC Output
NOTE: The DC shunt must be installed on the
negative (-) terminal of the battery (Figure 18). All
connections must be clean and tight for correct
amperage readings.
1. Attach meter test leads before starting
engine.
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2. The regulator-rectifier test will be performed
in the 300mV== position.
3. Attach RED meter test lead to the RED post
terminal on shunt.
4. Attach BLACK meter test lead to BLACK post
terminal on shunt.
Figure 18
• With engine running at 2000 RPM, the
output should be 4-14 Amps.
• If no or low output is found, be sure that
the regulator-rectifier is grounded properly
and connections are clean and secure. If
there is still no or low output, replace the
alternator.

Disassemble Alternator

1. Remove pulley nut using tool #SST and 10
mm deep socket (Figure 19).
Figure 19