Generator Load Test
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 Mazda B4000, 2003 Mazda B3000, 2003 Mazda B2300, 2002 Mazda B4000, and 2002 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
To prevent damage to the generator, do not make jumper wire connections except as directed.
NOTE:
Prior to performing generator testing, turn OFF all electrical components. Place transmission in NEUTRAL, apply parking brake.
- Turn ignition switch to OFF position. Switch DVOM to ammeter function. Connect positive and negative leads to corresponding battery terminals. Connect current probe to generator connector A-172 (Black/Orange wire) located on generator.
- Start engine. Turn A/C on, blower motor switch to HI speed position, and set headlamps on HI-BEAM. Increase engine speed to 2000 RPM, while observing voltage output. If voltage rises at least .5 volts, the generator is operating normally. Go to next step. If voltage rise is not .5 volts, replace generator. See GENERATOR under REMOVAL & INSTALLATION. Retest system for normal operation.
- With engine running at 2000 RPM, monitor generator amperage output. See Fig 1 . If generator output is 58 amps or more at 2000 RPM, generator is operating normally. If generator output is not 58 amps at 2000 RPM, replace generator. See GENERATOR under REMOVAL & INSTALLATION.