Output Test

Ensure alternator drive belt is properly adjusted and battery is fully charged before performing the following procedure.

Fig. 2 Circuit Voltage Drop Test Of Alternator:

1. With ignition switch in the Off position, disconnect battery ground cable.
2. Disconnect wire from terminal B of alternator, then connect an ammeter between battery ground cable and alternator B terminal, Fig. 2.
3. Connect a voltmeter between B terminal and ground.
4. Connect battery ground cable to battery ground post and note voltmeter reading. The voltmeter should indicate battery voltage.
5. Connect a tachometer to engine, then start engine and turn on lights.
6. Operate engine at specified speed and note ammeter reading. The reading must be higher than the limit value. On Excel models, limit value should be 42 amps minimum. On Sonata models, limit value should be 53 amps minimum. If reading is lower but the alternator output wire is normal, then remove alternator for bench testing.