Cap questions

[blind34_1]

Okay lets see if I get a response to this or just blank stares...

I'm to be running enough of a load in my car to where my headlights will dim and the alternator wont put out enough. a new alternator is not an option right know (later, during engine swap), so I'm considering cap(s).

1 farad caps are expensive, and I'm poor. So I'm looking for a cheap solution, tell me if this would/could work:

I can get low value caps for cheap. These are the big blue caps bigger than a soda can. If I were to wire a bunch of these caps in series, does the benefit of having them make a comparable difference to buying a big 1 farad? I'm asking are the capacitances additive?