i think my voltage regulator is going out.. help diagnosing.

sometimes, ill be driving my car, and usually at night, ill have my lights on, be cruising, then all of the sudden, they get like, twice as bright, everything in my car is like on super power. my "amp" guage is pegged all the way over until i let off the gas, then it doesnt even go back to normal. whenever i hit the gas, even a little, it pegs itself again, then a few seconds later, sometimes a lot more, it bounces right back to normal and stays there. sometimes it will do it three or four times with 10 minutes. do you know how annoying it is to start coasting in the road waiting for it to go back down with a bunch of people behind you?

i figured it was my voltage regulator starting to act up, but im not sure where it is to have a look at it. and with my f-cking car leaking through the dash, it could be anything in there screwing up!

oh yeah, where can i get new wiper seals, the ones that go around the splined drive for the actual arm, where it meets the filler panel in front of the windshield?