Functionality (3.0L Only)

WARNING: This page is about a different car, the 2004 Mazda Tribute, 2003 Mazda Tribute, and 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: The following operation is for 3.0L models only. Information for the 2.0L models was not provided by the manufacturer.

With the ignition switch in the ON position, voltage is applied through the warning indicator "I" circuit to the voltage regulator. This turns the regulator on, allowing current to flow from battery sense "A" circuit to the generator field coil. When the engine is started, the generator begins to generate Alternating Current (AC) which is internally converted to Direct Current (DC). This current is then supplied to the vehicle's electrical system through the output (B+) terminal of the generator.

Once the generator begins generating current, a voltage signal is taken from the generator stator and fed back to the regulator internally. This voltage feedback signal (typically half the battery voltage) is used to turn off the warning indicator. With the system functioning normally, the generator output current is determined by the voltage of the "A" circuit. The A circuit voltage is compared to a set voltage internal to the regulator, and the regulator controls the generator field current to maintain the correct generator output.

The set voltage will vary with temperature and is typically higher in cold temperatures and lower in warm temperatures. This allows for better battery recharge in the winter and reduces the chance of overcharging in the summer.