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Generator Output

  1. Connect an ammeter (100-amp minimum) in-line between generator terminal "B" connector and terminal "B" of wiring harness connector. See Fig 1 and Fig 2. Turn headlights and all accessories on. Depress brake pedal. Operate engine at 2500-3000 RPM.
  2. Measure and record generator output. See GENERATOR MAXIMUM RATED OUTPUT  table. If amperage is as specified, go to next step. If amperage is not as specified, repair or replace generator.
  3. Turn off headlights and all accessories. Release brake pedal. Operate engine at 2500-3000 RPM and measure amperage under no-load condition. No-load amperage should be 5 amps or greater. If amperage is as specified, go to next step. If amperage is not as specified, repair or replace generator.
  4. Operate engine at 2500-3000 RPM. Measure voltage between ground and terminals "S" and "L". If 14.1-14.7 volts does not exist, repair or replace generator. If 14.1-14.7 volts exists, generator output is okay.
GENERATOR MAXIMUM RATED OUTPUT

Application Amps
2.0L 80
2.5L 90
Fig 1: Identifying Generator Terminals (2.0L)
G93E00707Courtesy of MAZDA MOTORS CORP.
Fig 2: Identifying Generator Terminals (2.5L)
G93I82345Courtesy of MAZDA MOTORS CORP.
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