I figured the bulb was burned out so I planned on replacing. With my big hands under there, I couldnt figure out whether it was a twist or pull bulb. Took out glove box to get at bulb and switch. Now the fun part, my tester says that there is power, but I cannot get the bulbs to light!!!! I spent 20 minutes trying different things in 100 plus degree weather and finally gave up. I tried several new bulbs - no light - switch is working as indicated by my tester??? Anyone with any ideas? ??? ??? ???