No-Load Test

Fig. 2 Alternator Housing Temperature Chart.:

NOTE: All accessories must be off and battery fully charged prior to performing this procedure.

1. Connect voltmeter between alternator (B) terminal and battery ground terminal.
2. Connect ammeter between alternator (B) terminal and battery (+) terminal.
3. Run engine from idle up to 2000 RPM and read both meters.
4. Readings should not exceed 10 amps and 14.4-15.0 volts at 68 deg F. Readings will vary with regulator housing temperature.
5. If voltage or current reading exceeds specification, check the alternator brush ground.