Alternator & Regulator: Description

The alternator is a small, high RPM, high performance type with an internal Integrated Circuit (IC) voltage regulator which controls charging system voltage. A transistor inside IC regulator controls alternator voltage output to maintain a constant voltage. Charging system voltage is maintained within an operating range of 13.2-15.0 volts. See ALTERNATOR REGULATED OUTPUT SPECIFICATIONS  table.

When ignition is turned on, battery voltage flows from alternator terminal "L" through IC regulator to terminal "E" and to ground, causing discharge warning light to come on. When engine starts, alternator RPM increases, which increases alternator voltage output. When alternator output voltage is greater than battery voltage, voltage to recharge battery flows from terminal "B". At the same time voltage at terminal "L" increases and the potential difference between battery and terminal "L" ceases, causing discharge warning light to go off.