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 60oF to 100oF (16oC to
12.45
12.24
12.06
11.89
v
v
v
v
50% charged
38
oC). The ignition key should be in the OFF position
25% charged
and all accessories turned off. Connect the positive (+)
meter lead to the positive battery post and the negative
0% charged
(--)
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 (see Battery Service in
the 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 three (3) minutes. Record the battery
voltage.
Useamultimeter settotheDCvoltssetting.Connectthe
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.
An example of a charging system that is functioning:
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: Uponstartingtheengine,thebatteryvoltagewill
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.
Glow Plug System Test (Workman HDX--D)
This is a fast, simple test that can help to determine the
integrity and operation of your Workman HDX--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.
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).Activatetheglowplugsystembyturningtheignition
switch to ON and record the multimeter results.
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
The Workman HDX--D glow plug system should have a
reading of approximately nine (9) amps per glow plug
(27 amps total). If low current reading is observed, one
(or more) of the glow plugs is faulty.
Electrical System
Page 8 -- 6
Workman HD Series
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