Alternator Output Test

Hookup Of Alternator.:

Alternator Output Curve.:

1. With the engine off, disconnect the white wire from terminal B on the alternator.

2. Hook up an ammeter (60 amp capacity or higher) at the alternator as shown.

3. Hook up a voltmeter at the battery as shown in figure.

4. Start the engine.

CAUTION: Don't let the voltage reading at the battery exceed 19 volts. If it does, shut the engine off, and then replace the voltage regulator.

5. Turn ON the:
^ Headlight switch (high beam).
^ Rear window defroster switch.
^ Heater blower switch (HI).

6. Check alternator output:

^ If it's within the output curve shown, the alternator is OK.

^ If it's not, test the regulator.