I have a 2005 Silverado 1500HD with the BOSE premium audio. Both Left front and left rear door panel speakers stopped working. Does anybody have any ideas? Amplifier in the console bad? Radio in the dash bad? Where do I start to troubleshoot?
Thanks in advance.

 

start by either taking it to a shop, or getting a digital multimeter and learning the functions (put it on 9V DC). test the speaker for power. If no power find the wire for the left channel at the plug for your radio, test for power there. If no power there (obviously while the radio is on), the radio is bad. If you have power there, test the amp's left channel out. if no power there then the amp is bad.