Negative rectifier

WARNING: This page is about a different car, the 2008 Suzuki Grand Vitara, 2007 Suzuki Grand Vitara, and 2006 Suzuki Grand Vitara. However, it is still accessible from the selected car via links, so may be relevant.

Using an ohmmeter, connect one tester probe to negative terminal (1) and the other to each rectifier terminal (2).
Reverse the polarity of the tester probes and repeat Step 1.
Check that one shows continuity and the other shows no continuity. If there is continuity, replace the rectifier.

Fig 1: Connecting One Tester Probe To Negative Terminal & Other To Rectifier Terminal
Courtesy of SUZUKI OF AMERICA CORP.