1999 Ford Expedition sub amp replacement

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goiby

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I am trying to install an amp in my 99 expedition. I have 5 wires to work with, black-orange, green-purple, red-black, black-green, and light green-black. I have listed below what I have on each and what I beleive they may be. Please let me know if I am even close on this. Don't want to burn something up.Thanks!

Black-orange= audio (-) 4.97vdc this wire and the red-black are in a foil sheid with a bare steel color wire.

red-black= audio (+).077vdc

green-purple= 7.31vdc No clue? Help!

light green-black= 12vdc

black-green= grd

 
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