Dimming Lights

Alright I have a 95' Galant some of you may reconize me from my intake problem that was fixed turned out one of the wires werent plugged into the destributer all the way. But back to the point for the past few months I have been having trouble with my lights on my dash, and my clock, and even the headlights dimming when im in idol, or when the fan turns on with the heater, or when the gears shift. Here is kind of a break down from starting up the car to truning it off. When I start the car it seems to be fine, but once it warms up, and the rpms go down they tend to start dimming, I then switch it to drive, and they dim even more. After that I start driving, and they start to get brighter, then I break and they flash right when I hit the break pedal. I then put it back in park and the light get a bit brighter. Then I turn it off. First I thought it was the battery so I bought a brand new one, and it helped a little because my lights were always dim before that picked it up to normal brightness while im driving. I then bought a new alternator, and that has helped a little bit more, but im still having the same problem. The problem began before any mods to my car including the intake, or the system, or even the foglights (which dont work anymore). any suggestions would be much appreciated.

sorry for the bump... ;)
but i feel i can help, when my alternator went out, the first thing i noticed was the left hand side of my clock dimming, the rest of the lights followed suit quickly, and soon i found myself trying to keep the engine at 6000 rpm long enough to make it home, sounds like the belt to me though, try tightening it

Sounds like an alternator belt. Like he said try tightening that belt. Should have no more than a 1/4 inch lateral give when you pull on it. If the belt is loose the alternator does not spin right and gives off less and some times more juice than it should. It'll screw up your alternator and soon enough your battery (overcharging-actually boiling the battery fluid). Been there done that, sulphuric acid fumes make the nuts shrink. Trust me.