[Blas]

"IF" the wiring colors on your car/alternator is similar to mine...
The BLACK wire goes to the STATOR (S) connection on the alternator, then there is a BLACK & WHITE wire which goes to the FIELD (F) connection on the alternator, and the large RED wire goes to the BATTERY (this is where all the power is supplied) And maybe a BROWN to a GROUND (G) connection too. From what you said you heard last time your turned the key on, (Where did that electrical sound originate from?) (hopefully the alternator?)
I would isolate the alternator from the car (remove all the wires) (CAREFULL - THE RED WIRE IS ALWAYS HOT) and quickly turn the key on, and see if the sound is gone? You may have toasted the alternator (and/or voltage regulator) with the wrong wiring arrangement earlier, have it tested.
I'm assuming all connections to the battery & chassis grounds are good too...
Your initial problem sounds like a bad cell in the battery to me...