How do you tell which are gnd and tbs terminals on Mazda 323?

To identify the ground (GND) and terminal block (TBS) terminals on a Mazda 323, consult the vehicle's service manual, which provides detailed wiring diagrams and terminal designations. Typically, the GND terminal is connected to the vehicle's chassis or battery negative and may be marked with a “-” symbol or color-coded black. The TBS terminals may vary in function, so checking the manual is essential for accurate identification. Additionally, a multimeter can help verify continuity to ground for the GND terminal.