Back speakers won't work after stereo replacement

[lordflash]

I got a new radio in my 2010 GMC Yukon SLE
And my back speakers are not working at all the only speakers work are the front and I have no clue how to fix this.. anybody know how to help ?
Anyone know what that blu/bull plug is ?

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

I cannot personally assist you with your issue, but other members of this Forum much more knowledgeable than me in this area will chime in.

Am I correct in assuming that the rear speakers worked before the change? What interface module did you use to connect the head unit to the truck's wire harness?

 

[lordflash]

I got a new radio in my 2010 GMC Yukon SLE
And my back speakers are not working at all the only speakers work are the front and I have no clue how to fix this.. anybody know how to help ?
Anyone know what that blu/bull plug is ?

Does anyone know if it uses a amp for the back speakers and do I have to run a separate wire to trigger it to get my back to speakers I mean all my front speakers work perfectly but I've seen some videos where it's kinda common for people to have problems with the back after a new radio install

 

[lordflash]

And it does not have the Bose system

 

[Doubeleive]

I got a new radio in my 2010 GMC Yukon SLE
And my back speakers are not working at all the only speakers work are the front and I have no clue how to fix this.. anybody know how to help ?
Anyone know what that blu/bull plug is ?

1st step is to take that skyframe adapter and throw it in the garbage and get a proper adapter, then everything might work, might depend on that radio as well