Srsly?
We're not going to have any better luck diagnosing something like this over the internet than you are standing at the hood.
What a fun game.
I think it may be your leaking halogen fluid onto the alternator belt or maybe the e.g.r. filter is clogged...or maybe the truck wanted pizza. Does she ever like a Big Mac?
But seriously. When was the last time you changed the halogen fluid? Because that can make your alternator overcharge the battery if the belt is too tight. I assume you tightened it using a tensioner gauge? Chances are if it's your alternator failing because the e.g.r. filter is clogged OR BYPASSED, than chances are it killed your battery too , but that's better than hollowing out your catalytic convertor and putting it back on just to pass a visual. When is the last time you checked the tire balance?
What is the airspeed velocity of an unladen swallow?
Wat?
Do you mean a European or an African swallow?

Do you think it's the alternator or the battery?
Yes.
But why are you banging them coconuts together Patsy?
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