While driving at night I notice that my headlights will often dim just slightly (noticably though) and they also do it when I roll up my windows. Do I need a new battery or is it something more difficult?

 

this is normal. get an optima battery.

 

do you have a system? if so, and if you run it all the time, get a capacitor, its exactly what they are made for..decent prices on ebay, brands don't really matter

 

If you have a high wattage stereo system, you probably need a capacitor.

If not, then go to Autozone and get your alternator and battery checked.

 

I do no have a stereo system (yet) I have only replaced the front door speakers.

 

its normal

 

Unless you get an upgraded alternator, it's normal.

 

Yeh but its annoying they also seem to do it when I brake. Not only that but even my map lights dim when they are on.

 

this is normal. ur puttin more pressure on the battery and the cables when u try to roll up windows while the lights are on, this causes less electricty transfered to the lights, thus u see them dimming.

 

I know this might seem normal to everyone, especially with a substandard battery but you might want to check your ground wire. Mine used to do the same thing & it turned out that the ground strap on the negitive side of my battery was loose. Maxima's are notorious for having bad grounds, Stillen sells a grounding kit but I find it to very over priced. You can find grounding kits on ebay all day long for cheap, look into it. Heck you might even find a few ponys especially if your ECU is struggling to get good current flow from your battery. Just my 2 pennies........

 

^Yep. It's not normal. It means a ground or two is weak, rusted or something. Try to find some ground points and clean them up. I looked in the FSM but couldn't find them.