What has happened is....
The red and yellow wire on the loom need to be switched, the Sony looms
somtimes have this, they are just reversed.
Take out the stereo, find the main loom not the car loom but the
halfords/addon loom that allows you to connect an ISO stereo to your audi,
then take the yellow wire out, and swap it with the red wire, they should
pop out with slight effort with a sharp thin object, job done
Ok, there is 2 looms on an after market stereo <asuming someone hasnt cut
the old wiring> the first loom is the Audi one that connects to your Gamma
radio<the one installed at the factory> the 2nd loom is the aftermarket one
that is fitted by you or a car stereo place that allows the Audi wiring to
connect to a Sony Stereo<I have all sony as well>.
find the RED cable which thicker than most others on the 2nd loom and on the
same connector there is a YELLOW cable. there are also numorous other cables
but they are speaker etc cables.
At the moment the RED wire will be connected to the IGN live cable on the
Audi wiring loom, this is becasue the SONY aftermarket cabling is wired
wrongly, the RED wire should be connected to the PERM live connector, and
the YELLOW wire to the IGN live.
The easiest way to change this is to remove the MOLEX style pins and swap
them over i.e RED goes in YELLOW pin hole and vice vesa.
IF you have STANDARD Audi fit cableing and aftermarket stereo this is your
problem, I have seen it loads of times before, you cant do any harm either
as the red and yellow wire are both lives and the BLACK wire is your earth
HTH if you want to see pictures I could take some
Errr, but Sony radios were standard Audi UK supply at that time. How
they were connected up, I'm not sure. Audi UK bought the cars from the
factory without radios and supplied the dealers with the Sony radios
I opted to take delivery of my '96 A4 without a radio and installed an
Alpine unit myself. I do remember having to be careful to ensure that the
switched and permanent 12V connections were the correct way round.
Using the wired ISO connector from Halfords, and blindly following the
cable colours, would have resulted in the switched/permanent power
connections being wrong.
Of course, it may be that all Audi UK supplied cars of the time had the
radios incorrectly connected!
Peter Bell - email@example.com
Ben I am working on the asumption that you have a standard audi fit stereo,
and someone has added a after market stereo, If like Peter states you have a
factory fit Sony, which I have not heard of, then the wiring will be
But if the +0v is not there then you have a problem, the only other way is
too tap into another curcuit that cuts off when you switch off the ignition,
I would suggest Sunroof, or some other wire that turn's off when ignition
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