Electrical issues

Hiya,

I have a 2002 Civic EX (1.7L engine, I think) with just under 100K miles on it. About a month ago my car wasn't starting, even with a jumpstart, so I replaced the battery. After that, everything seemed fine until about a week or so ago. I was idling at a stoplight, and I noticed certain electrical items failed--the radio died, the gauges fell to zero, and the ABS light came on. As soon as I began driving again, they all started working again; this only happened once or twice and I forgot about it. A day later, my car wouldn't start. I jumpstarted it with no problems, and everything was fine for a week. Yesterday, the problem repeated--buggy electrics one day, no start the next. This time when I jumped it, we tested both the battery and the alternator--no dead cells in the battery, alternator was putting out a consistent 14 amps while idling. Any ideas what the issue might be? Thanks in advance.

--Austin