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Continuity will work just fine. Test black lead of multimeter to negative, red to red. Then the other way.

Use diode test on the digital multimeter. Test the positive and negative terminals forwards and back per the video I posted. You have eliminated any isolator fault. Do not worry about the external capacitor, it is only for radio frequency interference suppression.

You need to test again, this time using only the negative and positive terminals on each alternator. These are the terminals on the back, the positive is in the recessed portion and should have a red isolator. The drivers side will have a black 6 gauge wire from negative terminal to one of...

The passenger side alternator could have damaged isolators on either positive or negative connections. See this video, test between the positive and negative terminals..