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You have speaker wire signals connected to RCA inputs. That amp is really unlikely to have inputs that can accomodate BTL speaker level signals. Vibe amps are not common in the States and I don't know much about them, but I bet they do not have "balanced" inputs.
You probably need to lower your gains, and you may want to ground to the battery (I don't ever use those grounding brackets), and speaker level signals are NOT picking up the noise inductively.
You are hearing the noise because A) you are ruining your noise floor (by the way, if you are running speaker level signals in, your gains should be LOW, not HIGH), or B) you have an input problem (combination of ground loop and shorted speaker leads).
If you unplug all your RCAs at the amp and meter from one RCA shield to another, and get continuity, your shields are common, and that amp DEFINITELY can't take speaker level in.
If you don't get continuity, it may or may not be good at it.
Also, make sure trunk is assembled. Mechanical FP noise from trunk is audible if testing with R seat out/down...
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