Alternator Output

Connect an ammeter (80-amp minimum) in-line between terminal "B" connector and wire. See Fig 1, Fig 2 and Fig 3. Turn all headlights and accessories on and depress brake pedal. With engine operating at 2500-3000 RPM, measure output amperage.

Fig 1: Identifying Alternator Terminals
Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Alternator Terminals (1992 B2200, B2600i & MPV)
Courtesy of MAZDA MOTORS CORP.

Fig 3: Identifying Alternator Terminals (1992 All Other Models)
Courtesy of MAZDA MOTORS CORP.
If output amperage is not equal to or more than amount specified in ALTERNATOR OUTPUT table, repair or replace alternator as necessary.
Turn off all accessories and release brake pedal. With engine operating at 2500-3000 RPM, measure output amperage. If output amperage is not at least 5 amps, repair or replace alternator as necessary.
With engine operating at 2500-3000 RPM, measure voltage between terminal "S" and ground. If reading is not 14.1-14.7 volts, repair or replace alternator as necessary.

ALTERNATOR OUTPUT