a mysterious plug
 

hey guys I have a question does any buddy know where this plug goes ?
https://cimg9.ibsrv.net/gimg/blazerf...ff29a81e5b.jpg
https://cimg0.ibsrv.net/gimg/blazerf...fcc8f29d7a.jpg
https://cimg2.ibsrv.net/gimg/blazerf...23d2368d52.jpg
https://cimg3.ibsrv.net/gimg/blazerf...0927562c75.jpg
https://cimg4.ibsrv.net/gimg/blazerf...de86c78683.jpg
https://cimg6.ibsrv.net/gimg/blazerf...bed25aacea.jpg
https://cimg7.ibsrv.net/gimg/blazerf...0d7a0a565d.jpg
if I put 12 volts to two of these they start my truck !

Aftermarket remote starter that evidently is no longer there.