1990 GMC Suburban No interior lights, cigarette lighter or

Ok so lets see what I can do to help. Does it blow the fuse now right away or does it take a bit? Do you have a digital multi meter to do some checking if needed? What I would like you to do first is a process of illimination ok. Leave out the dome light does the fuese blow, unplug the cigarete lighter does it blow. Lets start there and get back to me with your findings.

#1 - unplugged lighter. Still blew.
#2 - unplugged radio. Still blew.
#3 - unplugged both dome lights, hasn't blown yet.

Usually it takes 12-15 minutes for the fuse to blow, but it's been over 30 minutes and it's still going. FYI: One of the bulbs I pulled is black on the inside but still lights up. Could this be the problem?

Also, I do have access to a meter if needed.

Ok great we have now figured out what circuit it causing the problem. Now I need to know if you have a digital multi meter and if you would be able to do some testing? If so then I will include wire colors and locations. We either have a bad dome light (not the bulb) or a bad door pin switch or a wire grounding out somewhere in the circuit. Get back to me with what you want to do and we will go from there.

I can test anything you want me to. Just tell me what I need to know. I can normally fix anything without much problem, but electrical shorts I don't have much experience with. Just say the word.

Ok what I would like you to do is remove the drivers side door pin switc that turns the light on. Ohm it then depress it and ohm it. Let me know what you find, we will start here as we have to start somewhere. Also here is pic of the wiring that includes the dome light circuit hope it helps.