I am replacing h7 bulbs on my foglights (aftermarket) and i realized that there is no marked positive or negative on the stock bulb or aftermarket bulb... which one is the positive?

 

Actually it doesn't matter since the current is going to flow through the filament one way or the other. The negative side is the metal case surrounding the bulb. The wire is the positive side.

 

Ok, if you really have to ask that question---- STOP f_cking around with your car and hit the books!!! This is elementry stuff, so lame it's not even in a Chiltons! Come on man, read, apply, learn. If you need a list of books PM me and I can give you the crash course in Auto 101, well at least the material, I'm by far no expert. I just know where to go to find the info.

 

the positive is the non-negative part.