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tail light wiring is black, brown and yellow. Which is L turn, which is R turn? on 2001 Buick Century

2001 Buick Century Custom, 6cyl

Asked by for the 2001 Buick Century
Turn key on and say the RIGHT signal light .. Using a test light or voltmeter - see which wire has power for that light - then do LEFT the same way .. It'd be hard to get that wrong!