Electrical System Quick Checks
Battery Test (Open Circuit Test)
Use a digital multimeter to measure the battery voltage.
Voltage Measured
Battery Charge Level
Fully charged (100%)
75% charged
12.68
12.45
12.24
12.06
11.89
volts
volts
volts
volts
volts
Set the multimeter to the DC volts setting. The battery
should be at a temperature of 60o to 100o F (16o to 38o
C).TheignitionswitchshouldbeintheOFFpositionand
allaccessoriesturnedoff.Connectthepositive(+)multi-
meter lead to the positive battery post and the negative
50% charged
25% charged
(--)
multimeter lead to the negative battery post. Record
0% charged
the battery voltage.
NOTE: Thistestprovides arelative condition ofthebat-
tery. Load testing of the battery will provide additional
and more accurate information (see Battery Service in
the Service and Repairs section).
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.
Start the engine and run at high idle (3450 RPM). Allow
the battery to charge for at least 3 minutes. Record the
battery voltage.
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: Upon 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.
Electrical System
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ProForce Debris Blower
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