Electrical System Quick Checks
Battery Test (Open Circuit Test)
Use a multimeter to measure the voltage between the
battery terminals.
Voltage Measured
Battery Charge Level
Fully charged (100%)
75% charged
12.68
12.45
12.24
12.06
11.89
V (or higher)
Set multimeter to the DC volts setting. The battery
should be at a temperature of 60o to 100oF (16o to
V
V
V
V
50% charged
38
oC).Theignitionkeyshouldbeoffandallaccessories
25% charged
turned off. Connect the positive (+) meter lead to the
positive battery post and the negative (--) meter lead to
the negative battery post.
0% charged
NOTE: Thistestprovides arelative condition ofthebat-
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.
Start the engine and run at high idle (2870 RPM). Allow
the battery to charge for at least 3 minutes. Record the
battery voltage.
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.
After running the engine for at least 3 minutes, battery
voltageshouldbeatleast0.50volthigherthaninitialbat-
tery voltage.
An example of a charging system that is functioning:
NOTE: Upon starting the engine, the battery voltage
will drop and then should increase once the engine is
running.
At least 0.50 volt over initial battery voltage.
Initial Battery Voltage
Battery Voltage after 3 Minute Charge
Difference
= 12.30 v
= 12.85 v
= +0.55 v
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
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.
CAUTION
Do not disconnect safety switches. They are for
theoperator’sprotection. Checktheoperationof
the interlock switches daily for proper operation.
Replace any malfunctioning switches before op-
erating the machine.
Electrical System
Page 5 -- 8
Groundsmaster 4000--D
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