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Workman MDX--D Electrical SystemPage 5 -- 7
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(16
o
to 38
o
C). The ignition key should be off and all accessories
turned off. Connect the positive (+) meter lead to the
positive battery post and the negative (--) meter lead to
the negative battery post.
NOTE: This te stprovides 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.
Remove battery cover 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 t he negative battery
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.
Makesure theshiftlever isin the neutral position andthe
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 three (3)
minutes. Record the battery voltage.
After running the engine for at least three (3) minutes,
battery voltage should be at least 0.50 volt higher than
initial battery 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 = 12.95 v
Difference =+0.65v
Glow Plug Test
This is a fast, simple test that can help to determine the
integrity and operation of your Workman MDX--D glow
plug system. The test should be run anytime hard start-
ing (cold engine) is encountered on a diesel engine
equipped with a glow plug system.
Use a digital multimeter and/or inductive Ammeter (AC/
DC Current Transducer).Properly connect the ammeter
to the digital multimeter (refer to manufacturers’ instruc-
tions) and set the multimeter to the correct scale. With
the ignition switch in the OFF position, place the
ammeter pickup around the main glow plug power sup-
ply wire and read the meter prior to activating the glow
plug system. Adjust the meter to read zero (if applica-
ble). Activate the glow plug system by turning the igni-
tion switch to ON and record the multimeter results.
The Workman MDX--D glow plug system should have a
reading of approximately nine (9) amps per glow plug
(18 amps total). If low current reading is observed, one
(or more) of the glow plugs is faulty.
Electrical
System