I bought a new radio and attempted to replace it myself in my crew cab truck (oem jbl system, amp located behind rear driver side seat). A local sound shop got me a harness and connected the wires from the harness to the new radio wires. Got everything connected and everything powered on but no sound. I plugged into the original radio and that one works perfectly fine and plays sound. I’ve seen one forum saying that the jbl amp is not compatible with aftermarket radios. Does anyone know if this is true? Is there anyway around this? Or is there just some trick I may have missed? Since a sound shop did the wiring I would hope that the connections are right.