Stereo wiring in '90 80Q, no switched DC?

[Huw Powell]

Jim wrote:
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> I recently bought a 1990 80Q and noticed the stereo (aftermarket) never shutoff. The display was always on. So I figured they just wired it wrong and pulled it out to take a look. Now I see why they did what they did. There doesn't seem to be a source of switched 12V back there. I measured every wire with the key on and the only +12 is the one they used which is always hot. Anyone been here before and figure out how the factory radio was powered?

factory radio = always on.  You have to turn it off manually.  Thus
there is no ignition-switched power nearby.

You will find, i think, if you look in the area of the aux relay panel
to the left of the steering column, a yellow bus thing that is the same
size as a relay socket.  If memory serves, that bus is ignition
switched.  Just take a wire with a 1/4" female on one end and (maybe
fuse it) run it to your radio.  remember there should still be an always
on battery wire to it as well for memory, etc.

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/