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Even with ground loop isolator, you would still be able to hear some engine noise (hissing sound) when your headlight is on.
Regarding the deck's power, this nav unit is also a CD player and does have its own power. It's adequate to run the Box's speakers system with clean sound because it sounds good in my wife's MDX.
The Circuit City's installer is screwing you up by making you buying the ground isolator. All they have to do is rewire the speakers wires directly to the back of the deck or run the wire from the deck to the speakers wires that are currently located at the stock amp.
Since you have shelled out that much for the deck, may be just go to a different shop to have the wires re-run. It should cost about the same as purchasing the isolator unit itself.
Hope this helps!
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