I would like to add that replacing the bulb will also provide a "like-new" shine & perhaps give better conductivity. I discovered upon removing my old one (same problem too), that the tip of the bulb was worn or malformed which lead to intermittent behavior. Hope you get your light!
ted@tednguyen.com
1994 ES300 BLK
189000 miles
Heat pkg
Cd changer
replaced eng (1/2002) @ 158,000 miles
numerous suspension work w/DC potholes !!