- Connect the Examiner in Voltmeter mode with the positive terminal to terminal D+ of the alternator and the negative earthed.- With the ignition on, ensure that the measured voltage is less than 5.5 Volts and that the generator warning light on the panel is on.- If the voltage is interrupted, the alternator is inefficient and should be replaced.- Start the engine and check, with voltage D+ greater than 5.5 Volts, that the generator warning light on the panel goes off and a correct battery recharging indication is displayed.