my 84 has a switch for the inside light. its located with the rocker switches below right of the stearing wheel (with the hazard and rear fog). for some reason my interior light switch has 2 clicks. only the 2nd one activates my internal light.
your asking a bit much for some automatic lighting on an 84 aint you? next you will want it to dim after 30 seconds on entry!
i blew the fuse on the wiper system and everything stopped. once replaced, it all worked again. so it would be safe to say, yes, one fuse.
hope this helps
G