Electrical System Quick Checks; Electrical System Quick Checks; Battery Test (Open Circuit); Charging System Test - Toro Groundsmaster 4000-D Service Manual

Electrical System Quick Checks

Battery Test (Open Circuit Test)
Use a multimeter to measure the voltage between the
battery terminals.
Set multimeter to the DC volts setting. The battery
should be at a temperature of 60
o
38 C). The ignition key should be off and all accessories
turned off. Connect the positive (+) meter lead to the
positive battery post and the negative (--) meter lead to
the negative battery post.
NOTE: This test provides a relative condition of the bat-
tery. Load testing of the battery will provide additional
and more accurate information.

Charging System Test

This is a simple test used to determine if a charging sys-
tem is functioning. It will tell you if the charging system
has an output, but not its capacity.
Use a digital multimeter set to DC volts. Connect the
positive (+) multimeter lead to the positive battery post
and the negative (--) multimeter lead to the negative bat-
tery post. Keep the test leads connected to the battery
posts and record the battery voltage.
NOTE: Upon starting the engine, the battery voltage
will drop and then should increase once the engine is
running.
NOTE: Depending upon the condition of the battery
charge and battery temperature, the battery voltage will
increase at different rates as the battery charges.

Check Operation of Interlock Switches

CAUTION
Do not disconnect safety switches. They are for
the operator's protection. Check the operation of
the interlock switches daily for proper operation.
Replace any malfunctioning switches before op-
erating the machine.
Electrical System
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Voltage Measured
12.68 V (or higher)
12.45 V
12.24 V
12.06 V
11.89 V
Start the engine and run at high idle (2870 RPM). Allow
the battery to charge for at least 3 minutes. Record the
battery voltage.
After running the engine for at least 3 minutes, battery
voltage should be at least 0.50 volt higher than initial bat-
tery voltage.
An example of a charging system that is functioning:
At least 0.50 volt over initial battery voltage.
Initial Battery Voltage
Battery Voltage after 3 Minute Charge
Difference
Interlock switch operation is described in the Operator's
Manual. Testing of interlock switches and relays is in-
cluded in the Component Testing section of this Chap-
ter.
Battery Charge Level
Fully charged (100%)
75% charged
50% charged
25% charged
0% charged
= 12.30 v
= 12.85 v
= +0.55 v
Groundsmaster 4000--D