Stand the alternator up on its bottom bracket with the pulley side facing toward you and the top bracket facing straight up.
Face the rear of the alternator toward you, and find the threaded stud and nut on the back of the alternator near the top---the location of the output (battery positive) terminal. The battery positive lead connects to this terminal via a ring terminal connector, with the nut holding it in place.
Find the voltage regulator socket located on the side of the alternator at the 3 o'clock position. The voltage regulator connector plugs into this socket.
Find the threaded stud and nut near the 5 o'clock position---the location of the ground terminal connection. The ground lead attaches to this terminal. (Keep in mind that some alternators come without a ground terminal.)