What interface is necessary when installing after market deck into 2006 GMC truck without "onstar". Will be replacing all factory equipment with after market audio. Let me know what to use? I believe it is a PAC or Metra harness but unsure which one?

 

gmco or pac equvalent could use a cheaper version the schoche 1 just use a relay for acc turn on because the turn thats in it is weak.

 

C2R-GM24 this is the 1 u need, i stress that this will not do bose

 

I have this harness in stock at the store if it interests you. I am out of the country right now but Brendan can look after you for it and tell him to give you a deal on it. Then ask him to see this thread for verification.