Yeah looks like someone added the dome lamp switch. Nice job.
Take a look at the fuse box behind the glove box. If you see a pair of wires instead of a fuse plugged into # 4 (dome over ride) that's what you got.
Usually though they are a two wire set up. Power in/out. With a ground wire also, you may have a switch that lights up when activated.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.