Get rid of those bulbs and switch to LED's. Use a LED with a T10 (?) wedge base. Get a replacement that has at least 200 lumens, more is better. Also get a warm light color LED. Cool whites have a blue tint. OOP's that one may not be a T10 wedge base. If it just has two wires in the base it is a little different, I don't remember what that bulb base is called. Some of the LED's have an adapter lead to fit any bulb base you have. Look around on Ebay for a replacement. Do comparison shopping as the same style LED may have a quite a spread in price. They aren't expensive, could be anywhere from .75 to 2.00 each depending on quantity. My TT is a 2014 model and has all LED interior lights already in it. I am replacing all the exterior ones with LED's now.
2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23
Camped 2015 - 47
Camped 2016 - 51 done - 6 more planned so far