Dome light wouldn't work when I opened the driver side door on my '04 Tacoma. 98Tacoma27 helped me i.d. the part and I ordered it. Came it today and I went out to install. Pulled the rubber gasket/cover off the old switch and found a dime wedged in to the back. Removed the dime and put the cover back on and the switch now works just fine. <facepalm>
I may just install the new switch just for the hell of it.