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Electrical System Quick Checks
Battery Test (Open Circuit Test)
Use a multimeter to measure the voltage between the
battery terminals.
Set the multimeter to the DC volts setting. The battery
should be at a temperature of 60
o
to 100
o
F (16
o
to 38
o
C). The ignition key should be in the OFF position and
all accessories turned off. Connect the positive (+) me-
ter 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.
Voltage Measured
Battery Charge Level
12.68 v (or higher) Fully charged (100%)
12.45 v 75% charged
12.24 v 50% charged
12.06 v 25% charged
11.89 v 0% charged
Charging System Test
This is a simple test used to determine if the charging
system is functioning. It will tell you if a charging system
has an output, but not its capacity.
Tool required: Digital multimeter set to DC volts.
Test instructions: Connect the positive (+) meter lead to
the positive battery post and the negative (–) meter lead
to the negative battery post. Leave the test leads con-
nected 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 charging system
voltage will increase at different rates as the battery
charges.
Start the engine and run at 3400 RPM (high idle). Allow
the battery to charge for at least 3 minutes. Record the
battery voltage.
Test results should be (example):
At least 0.50 volt over initial battery voltage.
Initial Battery Voltage = 12.25 v
Battery Voltage after 3 Minute Charge = 12.80 v
Difference = +0.55 v
Electrical
System
ProCore 648
Page 5 – 11
Electrical System