Electrical System Quick Checks
Battery Test (Open Circuit Test)
Use a multimeter to measure the voltage between the
battery terminals.
Voltage Measured
v (or higher)
Battery Charge Level
Fully charged (100%)
75% charged
12.68
Set the multimeter to the DC volts setting. The battery
should be at a temperature of 60o to 100o F (16o to 38o
C). The ignition key should be in the OFF position and
all accessories turned off. Connect the positive (+) meter
lead to the positive battery post and the negative (–) me-
ter lead to the negative battery post.
12.45
12.24
12.06
11.89
v
v
v
v
50% charged
25% charged
0% charged
NOTE: This test provides a relative condition of the bat-
tery. Load testing of the battery will provide additional
and more accurate information (see Battery Service in
Service and Repairs section of this Chapter).
Charging System Test
This is a simple test used to determine if a charging sys-
tem is functioning. It will tell you if a charging system has
an output, but not its capacity.
Start the engine and run at high idle. Allow the battery to
charge for at least 3 minutes. Record the battery voltage.
Test results should be (example):
Use a multimeter set to the DC volts setting. Connect the
positive (+) meter lead to the positive battery post and
the negative (–) meter lead to the negative battery post.
Leave the test leads connected and record the battery
voltage.
At least 0.50 volt over initial battery voltage.
Initial Battery Voltage
= 12.30 v
= 12.80 v
= +0.50 v
Battery Voltage after 3 Minute Charge
Difference
NOTE: Upon starting the engine, the battery voltage will
drop and then should increase once the engine is run-
ning.
NOTE: Depending upon the condition of the battery
charge and battery temperature, the charging system
voltage will increase at different rates as the battery
charges.
Workman 3000/4000 Series
Page 8 – 5
Electrical System
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