wiring questions

[Ti Kan]

millertyme writes:
> [ I have a 87 5K turbo ]
> [ Radio wiring question ]

> brown - ground,

yup.

> red/blue - hot

yes.

> yellow - ?

Radio "on" signal.  Used to trigger rear outboard power amplifier
turn-on and power antenna, as well as the ignition-off chime warning.

> gray/black - illumination maybe?

Yes, this is the illumination line.  On the 5Ks, it's supplied by the
instrument light booster.

> My questions are:
> is there a switched wire for the stereo, or do I have to run one

The radios of that era of Audi does not get power through the ignition
switch.

> I have 2 brown, 2 red/blue, and 2 yellow
> The brown are connected together, as are the yellow

The two brown wires *must* be tied together as they serve as a daisy
chain and run to different devices.  Ditto the yellow wires.
The extra red/blue wires are off the same tap (i.e., all are not
run through the ignition switch).

> The red/blue wires are not, but there is only power on one of them.  Am
> I right in assuming that the other taps off to the cigar lighter?  So
> they have to be connected together?

They should all have +12V power on them.  The power is supplied directly
from the fuse/relay panel via fuse S4, and then to a junction tap
"F" behind the dash where they fan out into all the various red/blue
wires.

> Also there is a 4 pin harness with green and green/black wires.  This is
> for the front speakers?

That runs to the crossover network for the front speakers.

> I already found the ones for the rear speakers

OK.  That's the one with the red, blue, black, and black/white wires.
This runs to the rear "Duo sound" headphone console as well as the
rear power amplifier.

> What wire is used for the power antenna?

See above.

-Ti
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