I have an Audi 100s I just bought a deck for the car and I can't seem to find the power wire or the wiring diagram because apparently they don’t make wiring harnesses for my car so you have to hard wire it does anyone know witch is the power it should be yellow but its not working it does have a alarm idk if you have to splice the two to get it to work

 

I'm not sure. I have the same car with an aftermarket in it and whoever put it in hacked it all to sh!te and did a terrible job.... I have yet to tackle trying to get the wiring done right on the stereo for the same reason that I can't find the info. I need to buy the bentley manual and get the wiring schematics. I'll take a look and see what color wires my power is spliced into, because mine does work. I'll let you know or post a pic.