Huh?
The gash lights, horn and stereo are all on the same 15A fuse. So if all three are out then it's most likely the fuse. Now if you're electrical's are all cobbled together then all bets are off.
For the door switches, there are usually two plugs for the driver side. One is for the light and the other is for teh key buzzer. If the doors have been off then usually the person will pull the plugs out from behind the switch.
He said he had tape on them. Well I got my 94 in 94 Used but very few Miles on it. Mine has tape on them so he may just be looking at old wiring.