When it comes to electrical problems, unless you have a few days to trace wires and test circuits, I'd take it to a shop and let them mess with it. Might be something simple, might be something complicated. Just went through this a few months ago on my roommate's car, we spend a good week tracing wires trying to find a short, took it to a shop and they had it fixed in under an hour.
"I'm not driving too fast...just flying too low"
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
90 7up vert - new project-07 DSG Focus -DD