ELECTRICAL SYSTEM

ELECTRICAL SYSTEM

SYSTEMS OPERATION

ELECTRICAL SYSTEM

The electrical system has three separate circuits: the

current (AC) is made; and stationary rectifying diodes that

charging circuit the starting circuit and the low amperage

change alternating current (AC) to direct current (DC).

circuit. Some of the electrical system components are

used in more than one circuit. The battery (batteries)

The alternator field current goes through the brushes.

circuit breaker ammeter cables and wires from the

The field current is 2 to 3 amperes. The rectifying diodes

battery are all common in each of the circuits.

will send current from the alternator to the battery or load

but will not send current from the battery to the alternator.

The charging circuit is in operation when the engine

is running.

An alternator makes electricity for the

Regulator (Motorola)

charging circuit. A voltage regulator in the circuit controls

the electrical output to keep the battery at full charge.

The voltage regulator is a transistorized electronic switch.

It feels the voltage in the system at the switch for oil

The starting circuit is in operation only when the start

pressure and gives the necessary field current to keep the

switch is activated.

needed system voltage. The voltage regulator has two

basic circuits the load circuit and the control circuit.

The low amperage circuit and the charging circuit

are both connected to the same side of the ammeter.

The load circuit has a positive potential from the input

The starting circuit connects to the opposite side of the

lead-of the regulator to the rotor (field) winding. The

ammeter.

control circuit makes the load circuit go off and on at a

rate that will give the needed charging voltage.

SYSTEM COMPONENTS

Alternator (Motorola)

Alternator (Delco-Remy)

The alternator is a three phase self rectifying

charging unit. The regulator for the alternator is part of

the alternator.

The alternator is driven from the

crankshaft pulley by two V type belts.

The only part in the alternator which has movement

is the rotor. The rotor is held in position by a ball bearing

at the drive end and a roller bearing at the rectifier end.

The compartment for the regulator is sealed. The

regulator controls the alternator output ac- cording to the

needs of the battery and the other components in the

electrical system.

Starting Motor

The starting motor is used to turn the engine flywheel

fast enough to get the engine running.

ALTERNATOR

1. Slip rings. 2. Fan. 3. Stator. 4. Rotor. 5. Brush

assembly.

The alternator is a three phase self rectifying

charging unit. The alternator is driven from the crankshaft

pulley by two V type belts.

The alternator has three main parts: a "rotating"

STARTING MOTOR

(turning radial motion) rotor (4) which makes magnetic

1. Field. 2. Solenoid. 3. Clutch. 4. Pinion. 5.

lines of force; a stationary stator (3) in which alternating

Commutator. 6. Brush assembly. 7. Armature.