Hi, I have a 1986 Mazda 323 (fuel injected). I was driving back home the other day when the electronics started to go. The radio started cutting in and out, and eventually faded to static. Next the tachometer would slowly drop down toward 0, but then catch again (just the gauge - the engine was running fine). Finally the engine started hiccuping (fuel injectors) and immediately everything died and I had to coast off the road. At this point everything was completely dead (no hazard flashers, even) and I had it towed home. Based on my very limited knowledge of cars, I guessed the alternator had gone, as the same thing happened to me in another car. I recharged my battery at home and it fired right up. My question is this: how can I tell what the problem is now? Assuming the alternator is broken, how long could my car run off of just the battery alone? Assuming it wasn't the alternator, what else might have caused this? Help! Many thanks!
~matt