27 Ampere Charging System (GR 3200–D)
The alternator is belt driven and externally regulated.
nector (Fig. 46 and 47).
Note: Prior to testing the charging system, make sure
and adjusted properly (see Belt Adjustment in Chapter
4 – Perkins Engine).
A digital multimeter and shunt are recommended for
testing the charging system. A shunt capable of han-
dling at least 40 ampere should be used. Also, a digital
multimeter with a high impedance millivolt scale (with at
least 300mv range) should be used in conjunction with
the shunt (Fig. 48).
1. Install the DC shunt on the negative terminal of the
reliable amperage readings.
2.
the shunt.
3.
post of the shunt.
4. Place multimeter to the millivolts scale.
5. Start the engine and run so the alternator is running
at 5000 rpm. Determine current output. Current output
should be from 1 to 27 ampere depending upon battery
across the battery terminals should be from 13.7 to 14.7
VDC.
6. If no or low current output is found, make sure all
low current output, remove shunt and test leads, recon-
1.
with sky blue and white wires leading from the alternator
Note: Prior to taking small resistance readings with a
ter will display a small resistance value (usually 0.5
from from the measured value of the component you are
testing.
HIGH IMPEDENCE
SHUNT
There are four terminals on the alternator electrical con-
the V–belt to the alternator is in good operation condition
Test Equipment
DC Current and Voltage Regulator Output (Fig. 49)
battery. Make sure all connections are clean and tight for
Attach RED meter test lead to the POSITIVE post of
Attach BLACK meter test lead to the NEGATIVE
voltage and/or current draw on the system. Voltage
connections are clean and secure. If there is still no or
nect battery, and test alternator output below.
AC Voltage Alternator Output (Fig. 50)
Make sure the engine is OFF. Disconnect connector
to the voltage regulator.
digital multi meter, short the test leads together. The me-
ohms or less). This resistance is due to the internal re-
sistance of the meter and test leads. Subtract this value
MULTIMETER
ALTERNATOR
REGULATOR
Figure 46
Figure 47
Figure 48
Electrical
System
Greensmaster 3200/3200–D
Page 6 – 41
Electrical System
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