Car stops while driving. Options

[dudeofchaos]

Alright, I was driving my car and suddently it stopped. I've already had to boost my battery earlier this month but usually the alternator gives you power when the engine turns so I first thought it could be the problem, though, when it stopped, all the lights were lacking power. Like they were... ''weak''? So when the engine's off the battery gives you the power, but it can't be the reason why the car stopped.

So could my alternator be dead? Which means I'd be running on my battery's and when it ran out of power the engine stopped? That's what came up to my mind 1st, would you think of anything else??
My alternator is only 3 years old and is a genuine toyota part, it would suck to be already dead...

[dudeofchaos]

Alright so I've unplugged the battery while the engine was running. Nothing happened, it kept on going. The I checked out the voltage and it was at 14.29V and after 2 minutes it dropped down to 14.21V ... Is that a big enough drop to mean anything or it's absolutly normal? I didn't test it for more than 2 minutes long because it was dark and I was with someone.

This post has been edited by dudeofchaos: Aug 13, 2011 - 12:02 AM