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1. Turn off the power to the fixture at the main panel,
then test the wires to make sure the current is off. Rub one lead
of a voltage tester ($3 at hardware stores or home centers)
against the ground wire and rub the other lead first against the
hot wire (black), then the neutral wire (white). If the tester
lights up in either case, the power is still on. Shut off the
correct circuit at the main panel.