Amperage Output Test
NOTE:
Ammeter with clamp-type test lead is recommended. After engine start-up, test must be done quickly as charging amperage will quickly drop.
- Disconnect battery ground cable and alternator output wire from alternator terminal "B". Connect ammeter in series between terminal "B" and disconnected output wire. Connect voltmeter between terminal "B" and ground. Reconnect battery ground wire. See Fig 1.
- Ensure voltmeter reads battery voltage. If voltmeter reads zero volts, suspect an open in wire between alternator "B" terminal and negative battery terminal, blown fusible link or poor ground.
- Turn on all electrical accessories. Start engine and accelerate to 2500 RPM. Read maximum output amperage. If alternator amperage output is within 10 percent of rated output, alternator is functioning properly. See CURRENT OUTPUT SPECIFICATIONS table.