Ampere Charging System (Gr3200-D) - Toro Greensmaster 3200 Service Manual

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