Alternator "buzzing" or "humming" when car is off, battery dies

[BonzoHansen]

Sounds correct for an old school internally regulated alternator. Perhaps this changed over the years? I'm sure the wire colors have changed.

I belive my 140 amp alternator has a 3 pin connector that goes to the alternator in addition to the BAT stud. I've been instructed by Speartech to find out what the pins are labeled as on that connector, and which one the voltage is coming out of.

They have not really changed. I use a CS130 and use 3 wires in my 77. I know I wired the the OE brown wire (idiot light) to the alt L terminal. For retrofits if there is no idiot light people put a resistor inline in place of the light.

What I don't know is the swap specific details, like if the alt goes through a BCM or something stock. I found this diagram for 96 Camaro on the auto zone site. Vin P is the V8. Does not look like it does for the V8 car, but I also see no S wire.


For the record, on my car:
Bat (red) hot constant
S (red) hot constant
L (brown) hot IGN



Just seeing if any of this helps any one and that my understanding is correct.