Alternator Output

Turn ignition on (engine off). If charge light does not come on, disconnect alternator body harness connector. If charge light does not come on when terminal "L" of harness connector is grounded, replace charge light bulb. If charge light does come on when terminal "L" of harness connector is grounded, check IC regulator and positive terminal of diode.

If charge light came on with ignition, start engine. If charge light remains on or blinks, check fan belt, check "S" or "B" terminal for improper contact and alternator output.

If charge light is off while engine idles, measure terminal voltage of battery while running engine at 1500 RPM. If voltage is 15.5 volts or more, replace IC regulator assembly. If voltage is less than 12.5 volts, check IC regulator as a single unit. If voltage is 12.5-15.5 volts, turn light switch on while engine idles. If charge light comes on, check diode assembly. If charge light does not come on, end test. There are no problems.