WARNING: This page is about a different car, the 2002 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.

Verify that the drive belt tension is within the specification. See BELT DEFLECTION under ADJUSTMENTS.
Turn the ignition switch to START and verify that the generator turns smoothly without any noise while the engine is running.
Using a voltmeter measure the voltage at the terminals as indicated in the table. See Fig 1 and GENERATOR VOLTAGE table.
Measure the current at terminal "B" using an ammeter. See Fig 2 and Fig 3 . If not as specified, replace the generator.
The values are measured with the battery fully charged. As the battery discharges, the current becomes greater. When the measuring condition is "electrical load ON", turn all the following electrical systems on.
- Headlight (High Beam)
- A/C (Max.)
- Brake Light
- Cooling Fan
- Condenser Fan

Fig 1: Identifying Generator Terminals

Courtesy of MAZDA MOTORS CORP.

GENERATOR VOLTAGE

Terminal	Ignition Switch On	Idle
B	B+	B+
L	Approximately 1Volt	Approximately 1Volt Less Than B+
S	B+	B+
IG	B+	B+

Fig 2: Measuring Generator Current

Courtesy of MAZDA MOTORS CORP.

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.

• Brakes feel soft, pull hard to one side, or make grinding noises.

• The engine overheats, stalls repeatedly, or misfires under load.

• You are missing required tools, torque specs, or safe lifting equipment.

• You are not confident in the next step or safety outcome.

Safety Warning

On-Vehicle Testing: Generator

Use the Manual With the Right Hardware

When to See a Mechanic