IF you have a trailer tow set up, check that first. If there is corrosion or debri there it could be causing a short. If that doesn't fix it, pull the bulbs out and examine them. I had one go bad and short out the fuse.
Hope that does it. If not, you will be digging into chassis wiring.
Did you ever resolve this issue? I have the same issue on my 03 renegade. No position lights on the driver's side and no turn signals. But all other lights work. I've changed all the bulbs and even the actual taillight assemblies along with the rear upper brake light. No trailer hitch installed (awaiting dealer parts so they can install, never had one).