Hi
Undo & redo all ground connections, preferably cleaning all surfaces (wire brush, eraser, contact cleaner, whatever). Assume all metal-metal contacts have insulation - scrape/clean it off. (Bolts/screws included.) Also it could also be the unstable voltage situation, and that suggests a bad alternator-chassis to engine to chassis/body ground, but bad body (or engine) to battery- ground could also account for it. So maybe that too is the audio ground problem. For the audio, it could also be bad power. You could clean all +12V contacts etc but try swapping the fuse first (in case of thermal fracture, or because it is a glass fuse) else at least remove & refit (to scrape the contacts).
Check this link for the wiring diagram:-
http://www.the12volt.com/installbay/vehiclewiring/1/yeard/Audi.html
Please get back to us if you have further query else please accept the suggestion.Thank you for contacting fixya.com
Rear iignts in rear na, removing and instaiiing
Fig. 325: Rear Lights In Rear Lid, Removing And Installing
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Removing
CAUTiON: • Switch off all electrical components.
. . Switch ignition off and remove ignition key.
o Turn light switch into "0" position.
o Open cap - 1 - for warning triangle.
o Rotate quick-release screw - 2 - counter-clockwise 90 C
and remove cover - 3 - from luggage compartment lining - direction of arrow -
Fig. 326: Removing Bulb Socket From Housing, Pressing Catch
Bracket Downward
Courtesy of VOLKSWAGEN UNITED STATES, INC.
o Disconnect electrical harness connector
o Remove bulb socket - 1 - from housing, press catch bracket
- 2 - downward - arrow - to do so
Fig. 327: Identifying Nuts, Clamping Bracket, Inner Tail
Lamp, And Clamp Mounting
Courtesy of VOLKSWAGEN UNITED STATES, INC.
o Unscrew nut - 2 - and remove clamping bracket - 1 -
o Remove nut - 4 - and remove inner tail lamp - 3 - toward
outside
o Remove clamp mounting - 5 - from body cut-out
Fig. 328: Identifying Clamp Mounting, Nuts, Inner Tail Lamp,
And Tabs
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Installing
Installation is the reverse of removal, noting the
following:
NOTE: • Make sure seal between body and tail lamp housing
seals properly.
. Attach clamp mounting -2 - at inner tail lamp and screw on
nut -3 - loosely.
. Attach inner tail lamp -4 - at body cut-out and make sure
grip tabs - arrows - of clamp mounting rest against body cut-out
. Slide clamp mounting - 1 - onto threaded pin of inner tail lamp and tighten nuts - 3 - and -5 -.
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