Thanks to all. As I stated very clearly the switch was an ALTERNATE - not the original. Therefore there is NO post for the brake light, and the diagram does not help here. Based on the responses given, it sounds as if though I must (a) string up a wire between the fuse post on the firewall and wire the other end (along with the orange wire) to either the "bat" terminal or the "aux" terminal "on the switch or (b)just wire the orange / brake wire to the aux or bat terminal. I"ll give it a shot.
