I don't think you'll find the other end of the wires in the interior. I'm pretty sure they are controlled through the computer. You may have to buy a new stalk (turn signal switch), as the stock switch is integrated in the end of it.
Or you could clip the connectors out of the stock harness and wire it up yourself using a relay and interior switch....
Wait a sec, you say you have the fog light harness? You should also have the factory switch. I would think that all you need to do is have the computer flashed by the dealer to tell it that it has fogs now. Maybe. Not sure if they would put a fog harness in without putting in the fog switch stalk.
Healthy is merely the slowest possible rate at which one can die.