Hi Brian
It's a long time (nearly 30 years) since I had a TL like yours, but I vaguely remember that on my 1970 model switch 1 was the main switch for the lights. The top position of switch 2 was for the sidelights, middle position dipped headlights, and bottom was main beam. Pushing in the lever operated the horn.
Hope this helps - your model may be different, though.