Electrical System Quick Checks
Battery 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. The ignition
keyshouldbeoffandallaccessoriesturnedoff.Connect
the positive (+) meter lead to the positive battery post
and the negative (--) meter lead the the negative battery
post.
12.45
12.24
12.06
11.89
V
V
V
V
50% charged
25% charged
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.
Makesuretheshiftleverisintheneutralpositionandthe
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.
Raise and support cargo box to gain access to battery.
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: When 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.
Workman MD/MDX
Page 6 -- 7
Electrical System
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