Aftermarket stereo how power it

[Stu.Audi]

Hi
I got pioneer double din
Also got half amp harness
But have no idea how get the stereo to swit h on as no power to it
Stereobeen testing and working
Just no clue how it work
As thought it be plug n play with iso harness

Help would be great

 

[SootySport]

Some of them need the switched and unswitched power leads reversed. Most need the iso harness as well.

 

[Stu.Audi]

Hey
Just finished it early it all working now has to run from steeo to fusebox for power to yellow