Confusing electrical problem

[elusive240]

If somebody could help me I would really appreciate it. I've got an electrical problem in my 96 240SX SE that makes no sense to me. When I use my brakes my instrument lights and my headlights dim. Also when I use my power windows I can see all of my instrument lights and headlights dim. Every so often it sounds like my driver side window motor actuates, and when that happens my lights dim as well. I just bought another window motor for my driver side window thinking that it might be causing the problem, possibly a short in the motor. I haven't received the motor yet so I don't know if it's going to fix it. If someone has had this kind of problem before, or could possibly help me out I would really appreciate it. Thanks in advance

[s13sr20chris]

just a little dim or a whole lot? if just a little then i would get a batt/start/charge test done at a nissan dealer(preferably) or at advance/auto zone(free).

[PhaneSoul]

all of these above and it may be your altinator

[elusive240]

I just got a new battery last week and it didn't fix the problem. My starter is pretty new, and I don't think that it has anything to do with it. I was really hopeing that it wasn't my alternator since an alternator isn't a cheap fix. Thanks for the help though!