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Workman MD/MDX Page 6 -- 7 Electrical System
Electrical System Quick Checks
Battery 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. The ignition
key should be off and all accessoriesturned off. Connect
the positive (+) meter lead to the positive battery post
and the negative (--) meter lead the 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 a charging sys-
tem is functioning. It will tell you if the charging system
has an output, but not its capacity.
Raise and support cargo box to gain access to battery.
Use a digital multimeter set to DC v olts. 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: When 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.
Make sure the shift lever is in the neutral position and the
parking brake is applied. Start the engine and run en-
gine at high idle (above 3000 RPM). Maintain engine
speed to allow the battery to charge for at least 3 min-
utes. Record the battery voltage.
After running the engine for at least 3 minutes, battery
voltage should be at least0.50 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 = 12.30 v
Battery Voltage after 3 Minute Charge = 12.85 v
Difference = +0.55 v
Electrical
System