Testing The Charging System - Toro Greensmaster 3120 Service Manual

Testing the Charging System

Greensmaster 3120
17230SL Rev C
Battery Voltage Table
At least 0.50 V over the initial battery voltage.
Initial battery voltage
Battery voltage after 3 minutes charge
Difference
This is a simple test that determines if a charging system is functioning. It tells
you if the charging system has an output, but not its capacity.
Tool required: Digital multimeter to set the DC volts.
1. Connect the positive (+) multimeter lead to the positive battery post and
negative (-) multimeter lead to the negative battery post and record the
battery voltage.
2. Start the engine and run it at high-idle speed (2,850 rpm). Allow the battery
to charge for a minimum time of 3 minutes.
3. Connect the positive (+) multimeter lead to the positive battery post and
negative (-) multimeter lead to the negative battery post and record the
battery voltage.
4. After running the engine for a minimum time of 3 minutes, the battery voltage
must be at east 0.50 V higher than that of the initial battery voltage.
Note: Depending upon the condition of the battery, its current charge and
the battery temperature, the battery voltage increases at different rates as
the battery charges.
Refer to the Battery Voltage Table (page 5–9)
system that is functioning.
for an example of a charging
Page 5–9 Electrical System: Electrical System Quick Checks
= 12.30 V
= 12.85 V
= +0.55 V