In dash electrical

[Rat Bastid]

while replacing my dash bezel i found a light w/ steel band and socket floating around,not mounted too squat,it is a black wire with purple dots that connects to this bulb socket and bulb and steel band,does it go on gauge cluster or could it be a courtesy light of some kind? it doesnt light up when i turn on my dome light,and being my dome light doesnot work either,i figured it might be interior floor courtesy light,if so where does it mount.............whew.....thanks for any help,you guys rock