You should've seen what the wiring looked like before I had a go at the fuse boxes. Someone had removed the cover to the fuse box in the cabin so they could splice wires DIRECTLY into some fuses. I didn't note which fuses were being abused, I just yanked the wires out and replaced the fuses with new ones. This whole car has been something of a nightmare.
I'll do the meter test. I, too, hope that it'll be one massive short and not a bunch of small drains.
Thanks for the response!!