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Most are integral that is built on to the alternator 1 modular plug. Some did have a external regulator 2 individual studs and 1 wire module plug. If it is that style then look on battery side could be on radiator support or front apron.
If your fan isn't running it shouldn't be drawing electrical current, but this procedure should narrow down the cause:
The positive battery cable goes to the starter and a couple fusible links feed the fuse block from there. I recommend hooking up an ammeter inline with the negative battery cable and pulling fuses until you find the one that stops drawing current on the ammeter when you pull it. At that point you will have found the circuit that your battery killer is on. Look at a wiring diagram for your car and see what devices are on the guilty circuit. Look and see if those devices are on/broken/shorted.
Common causes of "overnight dead battery" are: courtesy/trunk light on with doors/hood/trunk closed/sticky power door lock solenoid/aftermarket equipment installed to constant power instead of keyed power.
Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.
Definitely sounds like a starter. When a bad starter is cold, it will start the car. After riding around for a while or after several starts in a row, the starter heats up and won't start without a boost. Since you've ruled out the battery and alternator, I'm positive a new starter will solve your problem. Good Luck!