TROUBLE SHOOTING
Note. For additional trouble shooting, see TROUBLE SHOOTING article in GENERAL INFORMATION.
Current Test (A4 & A6)
Ensure battery voltage is at least 12 volts. Disconnect Blue (D+) wire from generator. Connect digital ammeter between generator Blue wire terminal and Blue wire. Set digital ammeter to 200-mA range. Turn ignition on. If amperage is not 150-185 mA (milliamps), check Blue wire between generator and instrument panel, and check instrument cluster printed circuit.
Resistance Test (A4 & A6)
Disconnect negative battery cable. Disconnect Blue (D+) wire from generator. Connect ohmmeter leads between Blue wire and battery positive terminal. Turn ignition on. Resistance should be 140-160 ohms. If resistance is not 140-160 ohms, check generator bulb. If bulb is okay, replace instrument cluster printed circuit and retest.