I'm trying to rebuild the original radio that came with the car, apparently whoever had it last decided they didn't need any of the original clips... So anyway, I got new plugs and hooked spliced them onto the old wires, same color-to same color, and it came out of the same year of car so I know there are hooked up right. Here's the trouble, though. First, I have one wire that doesn't seem to go any where in the harness, its kind of an off-white color, and on the diagram it goes to the front speaker amps IIRC, but I don't see where it goes on the radio. Second, the radio won't turn on. When I turn the lights on, the buttons light up, but it won't turn on. As I'm sitting here, I may have an idea, which wires have constant +12v, and which have it switched, does any one know? I just realized I didn't check that.

It's a 1986 N/A with the radio/cassette deck/equalizer.

 

I have the same issue/ same radio. If you look at an FSM wiring diagram you'll be able to figure the wires out. However, I believe that my problem lies behind the dash at an open wire. Not looking forward to that.

 

What are the wire colors for adding aftermarket radio
LTBlue/Red= 12v+
LtBlue/White= +Accessory
LtBlue/Yellow= -power ant trigger
Red/Black=+ Lumination
White=Factory Amp Turn on

Ground to the body, use the 10mm bolt behind the center console front drivers access panel. Do not use the Red/Black as ground it will damage the interior light circuit and dimmer in the car

Front Speakers (maximum of a 15 watt peak from the radio):
LtGreen/Red= Left
LtGreen/Black= Left

LtGreen= Right
LtGreen/Yellow=Right

Rear Speakers (if applicable, if you have the amplified rear speakers again the Maximum of 15 watts peak is all the stock speaker amp input can handle):
Brown= Left rear
Brown/White= Left Rear

LtBlue= Right Rear
LtBlue/Orange=Right Rear

Note: as mentioned above the power antenna's trigger is ground (or - ). With all aftermarket radio's antenna output as 12 volts positive (+). To make a stock power antenna work you need a relay wired like this:


Some S4 models will have amplified doors woofers. There will be a round 6 pin low level DIN plug found on these models at the back of the radio.

Stock Speakers / Amps
Speaker Size:
Dash: 130mm (4”)
Door: 160mm or 150mm (6”) (note: true 6.5” speakers are 170mm)
Rear tower: 4” or 6"
Headrest: 3.5”
Rear floorboard: 5.25”

Amp Locations:
Door speaker amps are behind the driver’s dash speaker.
Front dash amps are next to the radio, or on the passenger’s side next to the pass speaker.
Rear amps are next to the radio (6" speakers), or on each speaker (4" rear speakers).
Headrest speaker amp is in the driver’s side just below the B pillar

 

so then the white wire needs to be hooked into the switched +12v, correct?