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The radio system was built for a rear view camera with a microphone in it. When camera active wire to the radio is triggered by the camera combiner box, it mutes the radio and turns up the volume so you can listen to the camera's microphone. The radio is not smart enough to know you don't have a mic in the side view cameras. I don't think the later coaches have a rear camera with microphone, either.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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