Under Voltage Test

If voltmeter does not indicate more than .5 volts above base voltage, proceed as follows:
1. Disconnect plug from regulator and connect an ohmmeter between regulator terminals A and F. Meter should indicate 2.4 ohms or more.
2. If ohm reading is not as specified, service alternator/regulator unit for a failed regulator and check for shorted rotor or field circuit.
3. If ohmmeter reading in step 1 is greater than 2.4 ohms, connect regulator plug.
4. Connect a voltmeter ground lead to alternator rear housing.
5. Connect voltmeter positive lead to regulator terminal A. Meter should indicate battery voltage.
6. If no voltage is present, service terminal A circuit. Proceed to step 18.
7. If voltmeter indicates battery voltage, turn ignition switch to Off position and connect voltmeter positive lead to regulator terminal F.
8. Meter should indicate battery voltage.
9. If no voltage is present, service alternator/regulator assembly. Proceed to step 18.
10. If voltmeter indicates battery voltage, turn ignition switch to Run position with engine not running and connect voltmeter positive lead to regulator terminal F.
11. If voltmeter indicated more than 1.5 volts, perform REGULATORS AND/OR I CIRCUIT TEST and service circuit as necessary.
12. If voltmeter indicates less than 1.5 volts, disconnect alternator plug, connect a set of 12 gauge jumper wires between alternator B+ terminal blades and mating wiring connector terminals. Perform LOAD TEST but connect voltmeter positive lead to one of B+ terminals.
13. If voltage rises more than .5 volts above base voltage, service alternator to starter relay wiring.
14. If voltage does not rise more than .5 volts, connect jumper wire between alternator rear housing to regulator terminal F.
15. Repeat LOAD TEST with voltmeter positive lead connected to on of B+ jumper wires.
16. If voltage rises more than .5 volts, replace regulator.
17. If voltage does not rise, service alternator.
18. Repeat LOAD TEST measuring voltage at battery terminals after servicing.