4k Audi(o) question

[Greg East <gregeast@frii.com>]

Stayed up late last night trying to install my spiffy new Blaupunkt
CD/Receiver and have a few questions:

1. The stock wiring harness has four wires:
	Red/grey wire - +12V to the battery
	White - antennae power 
	Brown - ground
	Blue/grey???? (Anyone know what this wire is for?)

2. My receiver has four wires as well
	+12V constant battery
	Switched to ignition
	Antennae power
	Ground

My real question is, since Audi wires their radios to be independent of the
ignition switch, what should I do with the wire from the radio that's
intended to be switched by the ignition? If I connect it to the +12V
red/grey wire, the radio will work, but the backlit clock doesn't go off
even if the unit itself is powered down. 

Any help would be greatly appreciated.

TIA

Greg East
Loveland, Colorado USA
gregeast@frii.com