Hey KM, I had the same problem in my '95 Caravan....interior lights, radio, and door locks not working....on the '95, the Ignition Off Draw fuse is a 15 amp fuse in the Power Distribution Center next to the battery under the hood....I replaced the 15 amp fuse and, low and behold, the problem was fixed....you saved me the cost of a mechanic trying to trouble shoot this problem.... no telling what he would have charged me or even if he would have discovered the solution.
Thanks!!!
PH