I was just installing a new radio in my '87 Monte SS and I left the door open for 3 hours like a complete idiot...

With that said, I heard a pop noise from under the dash and now my interior lights and radio won't come on when I crank it.

My exterior lights still come on, but not interior/radio...

Please tell me I just blew a fuse...

 

Sounds like a popped fuse

 

OK > You Blew a Fuse
`1. Check all fuses & report back for MCF duty
2. Good Luck

 

Yep sounds like things got heated up. Sounds like you have a short fuse?