Electrical short?

[topo4u20]

Hi Folks...,need some help if possible.

Just bought this truck and having issues again. I just noticed that when all the doors are closed the courtesy lights stay on very dimly. I did not think it would drain the battery but turns out it did today. I have pulled the courtesy fuse for now and for some reason this fuse knocks out the radio..I thought the radio fuse would do that?
Anyway, if anyone has any ideas on this I would love to hear. Maybe a relay?
Thanks so much

 

[topo4u20]

Well, after a couple of hours of searching it looks like it may be in the cargo lights. For some reason this just occurred the other day. I checked all the circuits but left the cargo lights last. Not sure the exact problem but after I flicked the cargo light switch a few times the lights all went out as per normal.