Alternator Whine when car off.

[Panzer4]

EDIT: Solved - see post dated Nov 14, 2014.


Hi guys,

Car: 2000 GTP

So something has been killing my battery when I let it sit overnight, and I think its my alternator.

When I turn the car off with the battery connected, I get a periodic low electrical hum/whine from the alternator. This noise sequence is thus: low hum for 2 seconds then off for 2 seconds, then hum again for 2 seconds then stops, etc.

Any idea on if/how I can test this? Read somewhere that the 'field' part of the alternator might still be powered once the car is turned off, and this could be causing the battery drain, but I'm nor well versed enough with electrical knowledge to test this.

Thanks.

PS. Mods, if this is the wrong section, let me know and I'll move it.