I'm gonna be installing a stereo in an 04 explorer and I looked a tthe radio today and found some confusion. So there's the standard for harness, and then there is another plug with two wires, i think one was black/yellow, and one was gray maybe?
What is this extra harness for? IS that for an external subwoofer that came in it?
See this pic below showing the set of plugs. You can see the second harness, it has some RCAs, which, I guess if it IS for subs, will just get plugged into the sub out on the head unit? I'm thinking it might be right but I need verification.