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 ELECTRICAL SYSTEM
TESTING AND ADJUSTING
ELECTRICAL SYSTEM
TEST TOOLS FOR ELECTRICAL SYSTEM
NOTE: Make reference to Special Instruction Form No.
SEHS8268 for more complete information for use of the
Tools Needed:
6V4930 Battery Load Tester.
6V4930 Battery Load Tester.
8T900 AC/DC Clamp-On Ammeter.
6V7070 Heavy-Duty Digital Multimeter or
6V7800 Regular-Duty Digital Multimeter.
Most of the tests of the electrical system can be
done on the engine. The wiring insulation must be in
good condition, the wire and cable connections must be
clean and tight, and the battery must be fully charged. If
the on-engine test shows a defect in a component,
remove the component for more testing.
The
service
manual
TESTING
AND
ADJUSTING ELECTRICAL COMPONENTS, Form No.
REG00636 has complete specifications and procedures
for the components of the starting circuit and the
8T900 AC/DC CLAMP-ON AMMETER
charging circuit.
The 8T900 AC/DC Clamp-On Ammeter is a
completely portable, self-contained instrument that
allows electrical current measurements to be made
without breaking the circuit or disturbing the insulation on
conductors. A digital display is located on the ammeter
for reading current directly in a range from 1 to 1200
amperes. If an optional 6V6014 Cable is connected
between this ammeter and one of the digital multimeters,
current readings of less than 1 ammeter can then be
read directly from the display of the multimeter.
A lever is used to open the jaws over the
conductor [up to a diameter of 19 mm (.75 in.)], and the
spring loaded jaws are then closed around the conductor
for current measurement. A trigger switch that can be
locked in the ON or OFF position is used to turn on the
ammeter. When the turn-on trigger is re- leased, the last
current reading is held on the display for 5 seconds.
6V4930 BATTERY LOAD TESTER
This allows accurate measurements to be taken in
limited access areas where the digital display is not
The 6V4930 Battery Load Tester is a portable
visible to the operator. A zero control is provided for DC
unit in a metal case for use under field conditions and
operation, and power for the ammeter is supplied by
high temperatures. It can be used to load test all 6, 8 an
batteries located inside the handle.
12V batteries. This tester has two heavy-duty load
cables that can easily be fastened to the battery
terminals, and a load adjustment knob on the front panel
NOTE: Make reference to Special Instruction Form No.
permits a current range up to a maximum of 700
SEHS8420 for more complete information for use of the
amperes. The tester also has a thermometer to show
8T900 Clamp-On Ammeter.
when the safe operating temperature limit of the unit has
been reached.
150
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