Okay, I notice that when I just turn the motor off and remove the key, the stereo goes off with it, ...seemingly automatically like most vehicles. However I have the option of turning the stereo off first using the off button, when I do this the stereo's digital display says, "Good bye" then goes off.
I'll try that for a while and see what happens, but is that the norm? Other people in newer vehicles don't have to do that. Is it because my truck is an older (1985) model?, or was the stereo actually installed incorrectly?
I mean the freakin new stereo probably had more wires sticking out of the back of it, than my entire truck has under the dash. Surely improvisions were taken.