Check your hatch wiring again
Read this for more info:
Rear windshield wiper working by itself.
There is a beautiful picture of the wire damage inside the umbilical
I had a 2004 Focus wagon and the rear lights bases would burn out. Found out there are two different bulbs that will fit in there, yet the current draw is larger on one hence the heat. I was going to install the bulb with the light current, but would give less light, but the wagon got totaled by a DWI while parked