[Mark_T]

I did the same thing you're doing - took out the aftermarket unit that came with my car and didn't match the rest of the dash at all, and re-installed a factory radio. Although the aftermaket unit came with adapter plugs, the hack that owned the car before me chose not to use them and cut and spliced the wires instead. I have no idea why. At any rate, it wasn't too hard to fix it using a multimeter and the wiring diagrams supplied with the Bentley manual.

When I was finished it all worked fine. I didn't really care if it worked or not because I never use the radio. I just wanted it to look factory. I was actually looking for a non-functioning radio so that I could pick it up for cheap but, as I ended up with a working one, I figure I might as well spend the time to hook it up properly.