battery or alternator???

first of all, I just installed 2 brand new Naso Xenon Light bulbs (close enough to HID system)...so it was in daytime....i turned it on to have a look at it....it looks great....but somehow I forgot to turn off the headlights....and came back in the next day, tried to start my mustang...it won't start at all.....so i went to autozone, return the old alternator....got the new one....i installed it the new one....won't start....could it be the battery???? Let me know...thanks
 
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your alternator will do nothing for you unless your car is running. I cannot believe Autozone warrantied it for you? Did they test it? They should have asked you some questions to find your real problem. Sorry I am looking at this from a countermens point of view...I work for CSK. Def. a battery problem. It is dead now, take it and have it charged or replaced if need be.

-Josh

P.S.-The easiest way to burn up an alternator is to use it to charge a dead battery. NEVER do this unless you HAVE to. I have had a couple alternators come back for warrantty the same day they were purchased becasue of this problem.
 
mightypoof said:
P.S.-The easiest way to burn up an alternator is to use it to charge a dead battery. NEVER do this unless you HAVE to. I have had a couple alternators come back for warrantty the same day they were purchased becasue of this problem.

:nice: good advice, ive seen a few alt's go out this way.