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Here's how to diagnose and replace an alternator on a Mazda 3.

The alternator is responsible for turning the mechanical energy of the internal combustion engine to electrical energy that can charge the battery and power the electrical system in the car. In this video, a Mazda 3 with a defective battery killed the alternator, causing it to die when disconnected from a charger. Once the battery is replaced, the alternator still cannot keep charge.

A multimeter is used to test the battery voltage at idle (14VDC) and under load (12VDC+, with accessories such as the radio, wipers, fan and lights all turned on). A failed alternator would not keep the battery voltage above 12V and therefore cannot charge it. The alternator is accessed under the passenger side front of the engine. Once the belt tension is released, 4 bolts are removed along with two electrical connectors. A teardown and diagnosis of the alternator and its components, such as the voltage regulator, diodes, rotor and electromagnet, stator and bearings follows.

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