1998 Pontiac Grand Prix

For the past couple of months, my clock/radio light, on occasion, will go dim and then brighten back up, dim and brighten back up. This will
happen for a few minutes and then stop. No problems for days/weeks even. Then, it will start again. About a month ago I started my car and had no light on the radio at all. After driving for a couple of minutes it came on. All other interior lights were working. I also notice sometimes when I am parking that my headlights will dim and then come back full strength. Like when I'm breaking, shifting from drive to reverse or vise versa is when I notice it. I had my alternator replaced about 4 months ago. Thinking that maybe I got a bad one, I took it to my mechanic who hooked my battery? up to a voltage reader (sorry, I don't know the correct name) and the reading was a steady 14. Any ideas?
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What is it putting out when loaded?

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Sounds like the backlight in the radio.

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I had the same problem recently. I did the samething, got my alternator and battery checked. Both were good. Then I noticed that the + cable to the battery was a little loose. Tightened it up and I haven't had the problem since.
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