I have a 99 sierra with factory cassette with factory remote cd. I tried installing an aftermarket stereo and the stereo power stays on when the truck is off. Everything else works. I had the deck installed in 02 sierra and it worked fine. Iused the harness adapter form the 02 installation to install in the 99. Are the acc power and switched power reversed on these 2 vehicles?

 

figured it out... stereo turns off after door is open