How to Install a JVC KD-G140 Car Stereo to a 2002 Ford Focus?

BrianA

Member
I know what wires to match up for the speakers, but I need to know how to hook up the remaining 3 wires (black, red, yellow).

My initial thought is that the JVC Red wire (Switched 12V) is linked to Yellow/Green Focus wire (Switched 12V) and the JVC Yellow wire (Constant 12V) is linked to the Thick Orange/Black Focus wire (Constant 12V).

That leaves me with 2 ground wires and the Thin Orange/Black wire (Ford calls this the Radio Illuminating Wire) on the Focus. Where do they go?
 
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