Definitely sounds like a short. You should check the wiring of that circuit. If ou can take off your headliner to check the wiring up there on the roof, it's a start, but finding the cause of the short could be a long and painful process.
- 2011 Plasma Blue pearl WRX STI sedan
- SOLD -S256 TURBO 2.2 -SS/TC body, SS/Tc shocks/struts, B&G springs, 17"mags, TRS FX-R retrofits (50W/6000k)
Sometime if you can pull a little on the positive wire going to the dome light you might pull it away from where it is touching. I had mine apart today, just two clips hold it to the roof panel. Just pay attention as to how it is assembled so you can put it back together the same way. Even better take pictures before you take it apart so you have something to refer to if you hit a snag.