2000 FLD120 Sleep Dome Light??

I can't seem to figure out why the sleeper dome light in my 2000 Freightliner FLD120 doesn't work. I've replaced the bulb with the correct size, and am considering it's a relay. Does anyone have any pointers on what might be going on? Thanks!

 

Unfortunately mine doesn't come with a handy little dash switch like that =( Only in the back corner of the sleeper and on the light housing.

 

Thanks what's I'm trying to find, but I'm not sure where to begin looking in the relay box.

 

Yeah, I've got the cover off and everything, I just can't make any sense of what the heck's going on in there.

 

Okay, are you talking just the regular dirver/passenger doors?