Operation CHARM: Car repair manuals for everyone.

Alternator

Generator Specifications
Normal Charging System Voltages
Terminal A S I Alt B+ Batt Engine to Battery Ground
Key Off 12.0 V 0 V 0 V 12.0 V 12.0 V 0 V
Key On, Engine Off 12.0 V 0 V 1-3 V 12.0 V 12.0 V 0 V
Engine Running 12.0 V 6-7 V 12.0 V 12.0 V 12.0 V 0 V
No Load Test
B+ Terminal 13.0-15.0 V
Electrical accessories off, engine speed at 2,000 rpm.