TM 9-2320-269-20-1
ELECTRICAL SYSTEM
GENERAL
The electrical system consists of a combination of electrical systems and components necessary for the operation of the
vehicle. Included are: a starting and charging system, gage and sending unit system, lighting circuit, 24-volt converter
system, brake anti-lock system, and a derrick control system.
STARTING AND CHARGING CIRCUIT
The starting and charging system supplies the power needed to start the vehicle, operate the other electrical systems, and
maintain the power supply. It consists of: two storage batteries, alternator, starting motor, key switch, neutral safety switch,
magnetic switch, and a primer switch.
BATTERIES
There are two 12-volt lead-acid storage batteries mounted in a protective box on the right side of the front bumper
platform. They supply the power needed for the operation of the vehicle's electrical components.
The alternator generates an electrical charge to keep the batteries active and fully charged. It is belt driven by the engine,
and has an internally mounted rectifier and solid state regulator to meter the current flow to the batteries as needed.
STARTING MOTOR
The 12-volt heavy duty starting motor is a closed shift-lever type. It is mounted to the cylinder block and engages with the
engine flywheel ring gear to start the engine turning. KEY SWITCH
The key switch is a four position switch mounted in the instrument panel. It sends power to the vehicle's electrical circuits
with one position that sends power to the starting circuit.
NEUTRAL SAFETY SWITCH
The neutral safety switch is a plunger-type switch mounted to the transmission. It opens the starting system when the
transmission is not in neutral preventing the engine from starting when the transmission is in gear.
MAGNETIC SWITCH
The magnetic switch is a magnetically operated switch mounted on the firewall. It opens all other electrical systems when
starting the engine, allowing the starting motor to receive full battery power.
PRIMER SWITCH
The primer switch is a two-position spring loaded switch mounted in the instrument cluster panel. It sends power to the
electric in-tank fuel pump to prime the fuel system after the vehicle has been inactive long enough for the fuel lines to leak
down.
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