2003 trailblaser aftermarket unit

Hi guys can anyone help me here I have a trailblaser 2003 and when I install the headunit and I am using a harness PAC-C2R-GM24 to connect the headunit to the truck so I don't have to splice the wire but I get no sound. I hooked up the head unit to a set of speakers and I get sound from them, I then installed my factory stereo back in and it has sound but when I install it using the harness I have no sound Can anyone tell me whats going on.  

Is there a blue wire on the pac adaptor?  If so it is the amplifier turn on wire for the factory amplifier.  It may be labeled Power Antenna.  Connect it to the blue/white wire of your aftermarket deck.Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

i am an idiot wrote: Is there a blue wire on the pac adaptor?  If so it is the amplifier turn on wire for the factory amplifier.  It may be labeled Power Antenna.  Connect it to the blue/white wire of your aftermarket deck.

I think I remeber seeing that, Thanks alot I will try it tommorow.

Ok I hooked up the blue wire and still no sound.

Did you connect it to the blue or the blue/white wire of your deck?  Did you test it listening to the tuner or to a CD?Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

I accully hooked it up to both wires while the deck was on and both wires gave me no sound. I just don't understand it's driving me crazy.

Do you have a volt meter to make sure that your radio is putting out 12 volts on the blue/white wire?   Also when you connected the test speaker, were the rest of the speaker wires still connected to the harness?Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB

I really have no idea what you may have going on.  If you want to drive here I am sure I can figure it out. Let's Go Brandon Brown. Congratulations on your first Xfinity Series Win. LGBFJB