2002 chevy blazer factory stereo electrical question.
 

Im hooking up an aftermarket stereo and am havubg issues wuthout a harness. Can someone explain the presence of two harness connections in the rear of the factory stereo and how they both apply to the new stereo?
I apologize if this has previously has been discussed.

There is an install kit that you can get from an auto parts store (or even Walmart I think) that will adapt the aftermarket stereo to the harness connections in the truck.

I am aware. But im not able to have that luxury today and every wiring diagram i find is not accurate to what im looking at

I don't know if the attached will help you. It's from a 98. Some bonehead guitar hero PO had made a rat's nest of the wiring I had to unravel. I don't remember if the view is from the stereo side or the harness side.