Can't really help other that to tell you to check the outside speakers for weather breakdown. My sony exterior speakers had deteriorated to the point there were absolutely no cones left on them. The wiring from the head unit to the amp and speakers was also completely jacked up with converters, wrong wires, broken wires etc.Basically it was working in Mono. Took a day to figure it out. The people that hook these up are not Stereo installers, if it makes sound that's good enough.
Ross..
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2015 Ram 3500 CTD SRW, Aisin, Longhorn Edition
2011 Octane T26Y
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