2005 grand prix stereo install

[gpgtstan]

hey guys i want to get rid of the stock stereo hu in my 2005 grand prix GT and put in an aftermarket.....i was told i need a special interface harness i didnt know this before i bought just the regular harness from canadian tire ($14.99) i hooked it up like you normally would but i got no power the cd ejected and went in but no lights i seen a previous post about the same thing and that i would need to run a 12 volt power source i did that i now have power the cd is playing but the problem is now i have no sound coming from any speaker.....can someone help me with this thanx

[reallyfast1]

yes u will need somthing like these !!
Amazon.com: GM12-AUXV2 PIE Adjustable Auxiliary Input For 2002-2005 GM / Chevrolet / Cadillac / GMC / Pontiac Class II…
Amazon.com: PAC AOEMGM24 Add An Amp Interface, For Select GM Vehicles: Automotive

if u get 1 of these its as easy as 123!! it will give u alot of extra options with speakers!!

an other ??s PM me!!