Integral Regulator Units

Fig. 6 Voltage regulator test. Models w/integral regulator:

1. Disconnect ground cable from battery and the "Bat" lead from alternator output terminal.
2. Complete test connections as shown.
3. Ensure voltmeter reads zero. Any other voltage reading indicates a defective alternator.
4. Turn ignition switch to On position and ensure voltmeter reads within one-half volt of battery voltage.
5. Connect a suitable tachometer to engine, then start engine with a jumper wire connected between test ammeter terminals.
6. Remove jumper wire from ammeter terminals and immediately increase engine speed to 2000---3000 RPM while noting ammeter reading.
7. If ammeter reading is 10 amps or less, recheck voltmeter reading without changing engine speed to obtain a correct charging voltage reading. Charging voltage should be 13.9---14.2 volts at 77°F, with an allowance of .05---.09 volt for each 18°F variation of temperature.
8. If ammeter reading is more than 10 amps, continue charging battery until amperage falls below 10 amps, or replace battery with a fully charged one.