As above now beena bit of a saga this shit

Now my problem is this at night when driving about my battery light is faintly on and gets worse when doing anything like pressing windows etc etc and especially for some reason when pushing the brake pedal

Suddenly the car lights will just get dull when driving like a surge or somethings happened if you get what i mean , brand new battery and alternator , and re-fixed the blue wire onto back of alternaor as well but still no joy ? Thought about running a negative of battery to earth/body as i seem to have alot of cables conneced to postive side of battery and only one to negative side ? who knows it was just a thought , this is really pi$$ing on my chips , any advice welcome , also on start up i need to give it some revs to get battery light to go off , failing any this its going into a auto electrician asap