Alternator Output
Use care when connecting test equipment to alternator as alternator output terminal is connected to battery at all times. Never connect the regulator battery terminal to the regulator field terminal. This will permanently damage regulator.
NOTE:
Alternator test connections are made by removing cap, as shown, to gain access to recessed terminal in molded regulator block.
- Connect test equipment as shown in illustration. Be sure that jumper wire is connected as shown and that it is securely clipped to regulator field terminal. Close battery adapter switch, start engine, then open adapter switch. The voltage reading must be maintained between 10 and 15 volts. Increase engine speed to 2000 RPM. Turn off all lights and electrical accessories.
- Turn master control clockwise until voltmeter on tester indicates 15 volts. Observe ammeter on tester. Reading should be between 50 and 57 amperes. Return engine to idle speed before releasing master control knob.
- Test Conclusions - An output of 2 to 8 amperes below minimum specifications usually indicates an open diode rectifier. An output of approximately 10-15 amperes below minimum specifications usually indicates a shorted diode rectifier. An alternator with a shorted diode will usually whine, which will be most noticeable at idle speeds.