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Alternator Output

  1. Connect an ammeter (100-amp minimum) in-line between terminal "B" connector and wire. See Fig 1, Fig 2 or Fig 3. Turn headlights and all accessories on. Depress brake pedal. Operate engine at 2500-3000 RPM.
  2. If amperage is not as specified in ALTERNATOR MAXIMUM RATED OUTPUT table, repair or replace alternator as necessary. If amperage is as specified, turn off headlights and all accessories. Release brake pedal. Operate engine at 2500-3000 RPM. If amperage is not about 5 amps or more, repair or replace alternator as necessary.
  3. If amperage is about 5 amps or more, measure voltage between ground and terminals "S" and "L" while operating engine at 2500-3000 RPM. If 14.1-14.7 volts is not present, repair or replace alternator as necessary. If 14.1-14.7 volts is present, alternator output is okay.
ALTERNATOR MAXIMUM RATED OUTPUT

Application Amps
B2200 55
B2600i 60
Miata
A/T 65
M/T 60
MPV 70
MX-3
4-Cylinder 70
V6 90
MX-6 & 626
4-Cylinder 80
V6 90
Protege & 323 65
RX7 100
929 90
Fig 1: Alternator Terminal ID (B2200, B2600i & MPV)
G93D00706Courtesy of MAZDA MOTORS CORP.
Fig 2: Alternator Terminal ID (Miata, MX-3 4-Cyl., MX-6 4-Cyl., Protege, 323, 626 4-Cyl. & 929)
G93E00707Courtesy of MAZDA MOTORS CORP.
Fig 3: Alternator Terminal ID (MX-3 V6, MX-6 V6, RX7 & 626 V6)
G93I82345Courtesy of MAZDA MOTORS CORP.
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