Test A: Charging System Warning Indicator Is On With Engine Running (3.0L)

WARNING: This page is about a different car, the 2001 Mazda Tribute, 2001 Mazda B4000, 2001 Mazda B3000, 2001 Mazda B2500, and 2001 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

Using DVOM, measure voltage between generator terminal X-102b (Yellow/White wire) and ground. If battery voltage is measured, go to next step. If battery voltage is not present, repair Yellow/White circuit, then retest system. See WIRING DIAGRAMS .
Disconnect generator connector X-102a. See Figure. Measure voltage between generator connector terminal No. 3 (Black/Yellow wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair Black/Yellow wire. See WIRING DIAGRAMS . Retest system for normal operation.
Turn engine off, then move ignition switch to RUN position. Measure voltage between generator connector terminal No. 1 (Light Green/Red wire) and ground. If measured voltage is equal to battery voltage, go to next step. If battery voltage is not present, repair Light Green/Red wire. See WIRING DIAGRAMS . Retest system for normal operation.
Reconnect generator connector X-102a. Start engine. Measure voltage drop between generator connector X-102b and battery positive (+) terminal. If voltage drop is less then .5 volts, replace generator. See GENERATOR under REMOVAL & INSTALLATION. If voltage drop is more than .5 volts, repair high resistance in Yellow/White wire. See WIRING DIAGRAMS . Retest system for normal operation.