I have a 1996 blazer that’s dome lights stayed on constantly. I don’t know why but it wasn’t a big problem. All of a sudden my sun visors cover for the mirror fell off so the lights wouldn’t shut off. So I tried pulling the bulbs but they busted and all of a sudden it acted like the fuse for it blown but the cluster lights would shut off when I would take the fuse out and I still put a new fuse in. It still doesn’t work and I tried putting new wires in for the mirror.

 

Could there be a problem with the door jamb switch?

 

That was the reason the dome lights weren’t turning off but now the horn not anything attached to that fuse excepted the cluster will work

 

Interesting. I had same issue with dome light, hatch and horn not working and it ended up being a simple fuse on the side of the dash. replaced it and all was good again