I have a similar problem.. On my way home yesterday, the battery indicator turned on. But my car still started when I turned off the engine and started it again. I had it checked today at a Motolite shop in Espana thinking that the battery is the problem, (its already 2 yrs plus old) but the shop told me that it's the alternator that has a problem not the battery. My car is a 96 mitsubishi galant V6 automatic. Can you give me some suggestions?

Where can have it checked?
If in case I need to buy a new alternator how much is a brand new and a surplus?

Thanks !