2002 Olds Bravada electrical problem

Went to install new stereo system and now nothing electrical inside the cab works. The Truck starts up no problem and drives. Just no power to windows, locks, interior lights, no stereo, no air/ac. The instrument panel/gauges work but the light doesn't. Checked Battery cables, fuses, and unhooked onStar (not used by us or previous owner). Can someone please help? Thank you.

Had to be something during the stereo install. You'll have to back track and double check connections, pulled connectors, etc.

I bought the install kit, with the special adapters when I put another radio in mine.

We found the problem. I turned out to be the instrument panel battery in the fuse box under the hood. It tested fine with a voltage meter. Retested it with a test light and it was bad. Anyways, we found the problem. Thanks for your comments in helping me with my problem. Much appreciated.

Pasadeana

Thanks for the update.