I have a 1997 A4 1.8t pre-facelift that I just installed aftermarket 1-piece headlamp assemblies into. The only problem I have now is the fog lights... there no longer are any. The stock pre-facelift lights had them integrated into the assembly and the aftermarket 1-pieces do not. I am planning to install aftermarket fog lights in the lower bumper grills but after a bit of searching around, I cant seem to find any information on which wires coming out of the stock light plug powered the integrated fog lights. Is it possible to pull the wires out of the plug socket and run them to other fog lights?

On a slightly related note, I have the dial/switch on the dash for aiming the headlamps but the stock assemblies didn't have the motors for it. There is also a square plug with 3 wires behind the headlamp assys. but it looks way bigger than the plugs on pictures of the adjustment motors that I've seen. So, I'm not really sure if the square plugs are for the aiming motors or for something else. I'm going to order a couple of aiming motors for the new 1-piece assys. but I want to make sure I actually have the proper wiring in place for them first. Does anyone have a picture of the b5 pre-facelift aiming motors?

 

In the harness to the headlights, the green/yellow wire is the fog wire. Just tap into it, extend it down to the bumper, and power your fogs that way, with an appropriate ground.