Current Output Test

Fig. 2 Voltage Output Test Connections:

1. Connect test leads of charging system analyzer tool 078-00005 or equivalent to vehicle, following tool manufacturer's instructions.
2. Turn on all electrical accessories, then start engine and allow to run between 2500-3000 RPM.
3. Read and record maximum current output. Current output should be within 10 percent of rated alternator output.
4. If current output is within specifications outlined in previous step, alternator is functioning properly. If current output is below specification, proceed to VOLTAGE UNDERCHARGES/VOLTAGE OUTPUT TEST Voltage Output Test
The following test must be performed with a fully charged battery.
1. With charging system analyzer connected as outlined in previous test, start engine and run at approximately 2500 RPM.
2. With all electrical accessories off, read and record current output.
3. If recorded reading is less than 5 amps, proceed to next step. If current reading is greater than 5 amps, voltage loss in charging circuit is indicated. Check battery, alternator and engine ground cable connections. Clean or repair connections as necessary.
4. Connect positive lead of voltmeter to ``L'' terminal of alternator connector and negative lead to alternator case, Fig. 2. Ensure that ``L'' terminal connector remains connected during test.
5. If reading obtained at ``L'' terminal is less than 14.4 volts, proceed to REGULATOR POWER SOURCE TEST. If reading obtained is 14.4-15 volts, a problem exists in alternator stator or rectifier.