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Replacing radio

Minven Wang writes:
>My radio (on '86 5kcs) went dead last week.  I tried to replace it with a new
>digital radio, but couldn't figure out which is the +12v power terminal that
>is energized at all time.  The old radio is an offbrand junk that does not
>connect to this terminal.  Also I'm not sure about the terminal to the power
>antenna relay box.  There are many lose wires under the centre console.  
>ThoughI was an audiophile (and now an audiphile), there is one wire too much 
>to get
>the radio working.  Any suggestions?

>BTW, while the radio (including the cassette) went completely dead (no 
>the power antenna is still working.  So I figure that the problem must be
>within the radio, not the fuse or power line, and not the speakers (since 
>it is rare that all four speakers went dead).  Any comments?

I'd check the fuse first, there may be an in-line fuse, in addition to the one
in the fuse-box.  If the fuse is good, then get a little test-light (if you 
don't have a multimeter) and check the power wire (s/b red) for juice with the
ignition on (if radio power was switched on with ignition like in mine).  
If you can't find the power wire, then it's a process of trial and 
error.  Others have said the antenna has a separate relay so I assume that 
will work independently of the radio.  If you have power, then try swapping 
the radio out with the new one.  I'd label the various speaker wires first, in
my 87 5KT, Audi used a color coding scheme like green solid/green-and-white 
stripe go the same speaker.  If you're not sure, connect 1 speaker at a time 
until you've id'd them all.  I used white tape to label them for future use.

Steve Jagernauth	               	'87 951 Pearl Black 
AT&T BCS			  	'87 Audi 5K CST 
Bridgewater, NJ