actually there is no box or green button. it comes into the coach thru the floor behind the drivers seat, a bare cable with a female coax fitting crimped to it. going under the coach, you can see it bundled to frame rail covered with convoluted split plastic loom going to rear of unit. but i think you've hit on something, and that is there SHOULD be a amp plug there! i'll install one and see, thanks very much
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