yup the interior lights work. I picked up a used GM and it didnt make any difference. I was able to replace the worn out fan blower motor but very very little heat (another thread I am sure).
Havent checked into the ignition switch as it seems to be working well but I will try that one out too. I enjoy driving this car lotts of power and it is smooth. Also the PO had installed some boomer type stereo system in the car then ripped it all out before they sold it. So it could be any wiring issue behind the dash.
I have enjoyed learning about these cars though. Lots of reading on the internet!