TM 9-2320-272-24-1
1-22. ELECTRICAL SYSTEMS OPERATION
Nearly every component of models covered in this manual is affected by the electrical system. These
components and their electrical connections are described as part of the following electrical subsystems:
Electrical Terms and Definitions.
The following electrical terms and definitions will be frequently referred to throughout this section and
should be understood before proceeding:
Alternating Current (AC signal) - Current in a circuit that flows in one direction first, then in the
other direction.
Circuit - A complete path for electric current flow between components.
Circuit Breaker - An automatic switch that interrupts current flow in a circuit when the current limit
is exceeded.
Direct Current (DC signal) - Current in a circuit that flows in one direction.
Female Connector - One-half of a connector which fits over the other half.
Ground - A common return to complete a path for current flow in a circuit.
Harness - A group of wires connected between devices that are bundled and routed together to prevent
damage and make repair and replacement easier.
Male Connector - One-half of a connector which fits the other half.
Polarity - The direction current flows in a circuit (usually positive to negative).
Relay - An electromagnetic device that operates like an automatic switch to control flow of current in
the same or different circuit.
Reverse Polarity - The condition that exists when circuit polarity is connected opposite of that which
was intended.
Sending Unit - A device that produces an electrical signal and sends this signal to the device which will
make use of it.
Sensor - An electrical sensor takes a physical condition (temperature, oil presence or absence) and
converts it into an electrical signal.
Splice - A permanent physical connection of two or more wires.
Terminal - Fastener at end of wire used to connect the wire to an electrically-powered device.
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