Here's the context:

Really misty day, started car fine, drove a little, was coasting, car cuts off, battery light comes on. Pull over, re-start no problems, carry on. 200 yards later car cuts off, battery light comes on, can't re-start. Come back 20 minutes later, car starts, drive home.

The distributor shouldn't be the problem, I've heard stories about the main relay. I'm wondering if anybody has had a similar situation with the battery light coming on and the car re-starting with ease then not re-starting at all.

I changed a headlight the day before, but that shouldn't be an issue either. I've also noticed a few times while idling stopped the car will nearly sputter as if it's losing gas (hence main relay). Any info would be very helpful.