1994 Nissan Sentra 175,000 miles

I have a 1994 Nissan Sentra, it has 175,000 miles. Car runs great, but.
Here recently I have been having a problem. On the dash on the bottom right my battery light and parking brake light have been blinking on and off. I had the alternator checked, and it checked out good. THe car stills run great but it just makes me nervous that these lights come on. Sometimes they wont blink on at all, but sometimes they will flick on and off several times and other times they will stay on. When they come on I here a clicking noise and it also clicks when it goes off. I am afraid this means something bad is about to happen. Is there anyway to analyze or fix this problem?