Field coil control (Generator)

WARNING: This page is about a different car, the 2005 Mazda RX-8 and 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Terminal connected: 21 (+)-Negative battery terminal
Oscilloscope setting: 0.5 V/DIV (Y): 1 ms/DIV (X), DC range
Measurement condition: Idling after warm-up (no load)

Fig 1: Identifying Field Coil Control (Generator) Graph
Courtesy of MAZDA MOTORS CORP.