Radio stays on while car off?

[RIZZ]

my radio stays on when i take key out & open the door... this is an aftermarket radio.. it just started happening when i re-installed the head unit.. any suggestions????

2007 tahoe

 

[kntrydr]

It sounds like you some how switched the 12 volt and acc power leads your going to have to pull the head unit and check the voltage the only other thing could be a faulty bypass for the stereo I hade the same problem and it was the the bypass
Hope this helps