Yeah - I agree, might be a positive wire short. I don't think there is a main fuse, but there is a main relay under a shroud on the firewall. Could also be a battery internal short, they do that on occasion. I'd grab the battery from the car & haul it to a car shop. They'll test them for free & you can eliminate that as a problem before you tear anything else apart.
I'm pretty sure the starter is not fused. Check the harness wires running behind the engine from the tray on the passenger side firewall. That's where the positive junction blocks are for the battery pass-through from the trunk.