Occasionally, you may need to change the alternator of the Audi TT because it has worn out or the parts have gone bad. The Audi TT engine sits in the engine compartment sideways, with the alternator located near the front of the vehicle on the passenger side. The alternator belt runs from the alternator to the crankshaft. Changing the alternator is fairly straightforward and requires just a few tools. You should be able to do the job in about an hour.
Lift the bonnet of the Audi TT and prop it open. Disconnect the negative cable from the battery post with an open-end wrench. Locate the alternator near the front of the engine compartment on the passenger side.
Loosen the bolts securing the alternator to the bracket and the engine a couple of turns with a socket wrench. Move the alternator forward on the bracket and take the alternator belt off the pulley by hand.
Remove the electrical wiring plug from the alternator socket, pulling it straight off by hand. Unfasten the ground wire and the electrical wiring connector from the alternator, removing the bolts with a socket wrench.
Unfasten the alternator bolts with a socket wrench until you can slide them out of the alternator by hand. Lift the alternator out of the bracket and remove it from the engine compartment.
Place the new alternator in the bracket, sliding the bolts into the alternator and tightening them until they are just loose enough for the alternator to slide onto the bracket. Attach the electrical wires to the alternator with the bolts. Insert the electrical wiring plug into the alternator socket by hand.
Position the alternator belt around the pulley and pull back on the alternator gently with a small pry bar to add tension to the belt. Tighten the alternator bolts with a socket wrench while you are applying tension.
Reattach the negative cable to the battery post with the open-end wrench. Close the bonnet.
Always detach the negative cable from the battery post before working on the alternator.