TM 5-3805-26314&P-3
ELECTRICAL SYSTEM
The digital multimeter can be used to test circuits for
TROUBLESHOOTING METHODS
voltage or continuity. It can also be used to test diodes
and to make a measurement of current flow. The
Most of the connections between the harnesses on
instructions that come with the multimeter tell how to use
the motor graders are made with rubber "Sure Seal"
it.
connectors or with plastic "bullet" connectors. If these
connections are not tight, they can be the cause of
Failure of an electrical component can cause or be
electrical problems, either permanent or intermit-tent
caused by the failure of one or more other components.
(come and go). Make sure the connections are tight
Always find and correct the cause of the failure of an
before other tests are made.
electrical component before making a re-placement of
the component.
The voltage tester can be used to test a circuit for
voltage. The circuit tester can be used to test circuits
without voltage for continuity.
VOLTAGE TESTER
CIRCUIT TESTER
DIGITAL MULTIMETER
BLOCK DIAGRAM
The block diagram of the grader electrical system shows the flow of electricity to the different
parts of the system. It does not show all components, wires and connections. The block diagram
shows which of the components work together.
A dashed line in the block diagram is an indication of a control connection (a switch activates
4-18
