Dome light bulb is dead or bot working havent got to that yet, no trunk light, and the only think light wise that doesnt work is the instrument panel light dimmer switch which controls lights, i posted you my phone number as well
The current leak is something that does work, a broken wire that is touching ground, or something like that.
For example if the wire going to the dome light is broken but rubbing on the body, that creates a short. A good short should blow fuse. So this is somehting more sublte. Try removing all fuses on the hot side and see if the votlage drop with everything off goes away. There's other ways to track but thats a simp[le way to eliminate possibilities. Problem could be in the box itself. its a bit different than most of the A-body boxes.