An alternator is an electromechanical device that converts mechanical energy to alternating current electrical energy. Most alternators use a rotating magnetic field but linear alternatorsAC electrical generator can be called an alternator, but usually the word refers to small rotating machines driven by automotive and other internal combustion engines. In UK, large alternators in power stations which are driven by steam turbines are called turbo-alternators. are occasionally used. In principle, any
The charging system has three major components. The Battery, Alternator, and the Regulator.
This alternator works together with the battery to supply power when the vehicle is running.
The output of an alternator is direct current, however AC voltage is actually created and then converted to DC as voltage leaves the alternator on its way to the battery and the electrical loads.
Four wires connect the alternator to the rest of the charging system.
'B' is the alternator output wire that supplies current to the battery.
'IG' is the ignition input that turns on the alternator/regulator assembly.
'S' is used by the regulator to monitor charging voltage at the battery.
'L' is the wire the regulator uses to ground the charge warning lamp.
'S' terminal
Senses battery voltage
'IG' terminal
Ignition switch signal turns regulator ON
'L' terminal
Grounds warning lamp
'B' terminal
Alternator output terminal
'F' terminal
Regulator Full-Field bypass
The alternator contains:
A rotating field winding called the rotor.
A stationary induction winding called the stator.
A diode assembly called the rectifier bridge.
A control device called the voltage regulator.
Two internal fans to promote air circulation.
Most regulators are on the inside the alternator. Older models have externally mounted regulators.
Unlike other manufacturers, this model can be easily serviced from the rear on the unit.
The rear cover can be removed to expose internal parts.
However, today's practice is to correctly diagnose the problem and replace the alternator as a unit, should one of it's internal components fail.
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