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Reelmaster 3100−DPage 5 − 28Electrical Systems (Rev. C)
Electrical System Quick Check
Battery Test (Open Circuit Test)
Use a multimeter to measure the voltage between the
battery terminals.
Set multimeter to the DC volts setting. The battery
should be at a temperature of 60 to 100
o
F (16 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 the the neg-
ative 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.
Tool required: Digital multimeter set to DC volts.
Test instructions: Connect the positive (+) multimeter
lead to the positive battery post and the negative (−)
multimeter lead to the negative battery post. Keep the
test leads connected to the battery posts 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 high idle (2650 RPM). Allow
the battery to charge for at least 3 minutes. Record the
battery voltage.
After running the engine for at least 3 minutes, battery
voltage should be at least 0.50 volt higher than initial bat-
tery voltage.
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
Glow Plug System Test
This is a fast, simple test that can help to determine the
integrity and operation of the Reelmaster 3100−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.
Tool(s) required: Digital multimeter and/or inductive
Ammeter (AC/DC Current Transducer).
Test instructions: Properly connect the ammeter to the
digital multimeter (refer to manufacturers’ instructions).
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 supply wire and read
the meter prior to activating the glow plug system. Adjust
the meter to read zero (if applicable). Activate the glow
plug system (see Traction Unit Operator’s Manual) and
record the multimeter results.
The Reelmaster 3100−D glow plug system should have
a reading of approximately 27 Amps.