Have color connected harness all wires are connected power comes on and external speakers work just the factory speakers connected to harness not working
If you still haven't fixed this, look at your wiring harness. The blue wire that comes off your factory harness is the external amp in the Infinity stereo. I found this out when I hooked my Pioneer head unit up. Coming off the aftermarket stereo should be a blue wire that says remote. Hook those up and you should be good to go.
Check the fade on the stereo front to back . that truck only has door speaker i beleave.left to right .or balance.if that dont work you will have to find the door wires and cut and spice them into the others being sure to keep the +and - matched up .
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