Randy,

No, I didn't use a METRA harness since my own C230 radio change out went so easily without one.

Any idea how I can identify this power wire for the amp? As I recall, it may be the same color combo as the power wire for the radio. I'll check it tomorrow. Noticed a yellow wire with black stripe that was inside a black plastic tube all by itself. Any ideas on function for that wire?

I think we are making progress here. Will give it another go tomorrow.

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1999 C230 Kompressor
1998 C280 Son's car
1999 C280 Totaled by other Son