I have a 99 1.8t Passat with multiple electrical failures

Strange that they all failed at once. The headlights and directional signal could both be of a common cause - a faulty column combination switch. They're known to fail on the A4. Can you pull back on the turn signal stalk and have the high beams come on? If so, but the low beams don't work, then your stalk switch is bad. A new one is about $150 and installation involves removal of the airbag and steering wheel. Not a difficult job, but if you're unfamiliar with airbags you should have it done for you. Replace that and see if it fixes both the lights and the turn signals. If the signals still don't work, you have a dead signal relay (also common). It's built into the hazard switch on the dash. A new one is about $40. You have to slide the radio out of the dash, and reach inside to push up on the bottom of the switch to free it. Then it just pulls straight out and off of its harness. Plug the new one in and put it back in the dash, push the stereo back in, and you're done.

The wiper failure could be the other side of the column switch - that's less common but it does happen. I'm not sure what they run offhand, but you can get them at www.ecstuning.com. Replacement would be done at the same time as the combination switch, as they're screwed together.

The AC and fan failure could be many things, and that is best diagnosed by a shop.

The ignition switch is faulty, typically the contacts burn for the 501 power supply circuit. That is the circuit that provides main power to head lights, wipers blower motor and a few other accessories.