ELECTRICAL SYSTEM - TM-5-2410-237-230046

TM 5-2410-237-23

THEORY OF OPERATION - CONTINUED

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ELECTRICAL SYSTEM

NOTE

Refer to WP 0075 00 for more detailed electrical system theory of operation information.

General. The electrical system has three separate circuits: the charging circuit, starting circuit and lighting circuit. Some

electrical system components are used in more than one circuit. The batteries, battery disconnect switch, circuit breaker,

cables and wires from the batteries are common in each of the circuits. The lighting circuit and charging circuit are both

connected through the ammeter. The starting circuit is not connected through the ammeter.

Starting Circuit. When the starter switch is turned to the START position, the starter relay is closed and current is deliv-

ered to the starter solenoid. The solenoid engages the drive clutch and the starter rotates the flywheel, starting the engine.

Charging Circuit. The charging circuit is in operation when the engine is running. The alternator makes electricity for the

charging circuit. A voltage regulator in the circuit controls the electrical output to keep the battery at full charge.

Batteries. Two 12-volt batteries are used on the tractor. The batteries are contained in a battery box at the rear of the trac-

tor. Batteries are connected in series to provide 24-volt starting power for the tractor. A 24-volt, 50-amp alternator pro-

vides current when the engine is running and charges the batteries.

Battery Disconnect Switch. A disconnect switch connects or disconnects the batteries from the tractor electrical system.

The starting circuit can operate only after the battery disconnect switch is in the ON position.

Lighting. The lighting system consists of two headlights mounted to the hood, one floodlight at the rear of the machine

and a dash light. Control of the lights is by the dash light switch and the exterior light switch. The lighting circuits are pro-

tected by fuses located on the instrument panel.

Horns. The electrical horn button provides warning of the tractor's approach when pressed by the operator. A backup

warning alarm sounds whenever the transmission selector lever is in REVERSE.

Winterized Cab Electrical System.

Heater Control Switch. The winterized cab heater uses a three-position toggle switch. The heater's electrical circuits

are protected by a fuse on the instrument panel.

Front and Rear Defroster Control Switches. The winterized cab uses two, three-position toggle switches to control

the front and rear defroster fans. The defroster electrical circuits are protected by a fuse on the instrument panel.

Window Wiper Switches. Electrical window wipers on the winterized cab are controlled by two switches at the rear

of the cab. Each window wiper circuit is protected by a fuse.

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