Today I was driving my CRX and the battery light came on (and has stayed on since).  A stench of something burning (cant identify exactly)  came through the vents at almost the same exact time.  I checked and cleaned the connections, I checked the battery.  A friend of mine used a voltmeter, and its fine at 12.5 or so.  But it seems to not be taking a charge from the alternator because it goes down to 12 after I turn the car on.  If something is burning, i cant find it.  Any ideas what it might be?