Typically the radio only cuts out when put into reverse. Does it cut out for both left and right turns? (Sometimes they miswire it and it only cuts out for left, or only for right when it should cut out for just reverse.)
This also depends on if the switching is done within the radio or in the box (the old Jensens had camera and auto-switch inputs--there was a settings screen on the radio where you could turn off the audio input from each camera). Perhaps the radio has an on/off setting you can use.
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