I recently installed Subs on my 2010 GMC Sierra, I opted to keep the Stock Head Unit (its not a bose unit, No center console in truck). I Installed the Scosche LOC25l LOC unit, I tapped into the front R speaker and front L speaker. I tapped into the Head Unit power and ground for the LOC unit as well. when I turned the truck back on only the driver side speaker and tweeter worked and passengers side tweeter worked. The subs both worked fine also. I used a Circuit Voltage tester pen and all the speakers lit up, but no sound came from 3 of the door speakers. I've never had anything like this happen to me before! any suggestions would help a lot!
3 Door Speakers dont work after sub install to stock Head Unit
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BOSS560RBG How to connect a sub, powered or otherwise.- Started by Carlos_510
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