So why didnt you just buy the wiring harness to begin with? Couldn't afford the 10 dollar part?
I am not sure what you problem could be, but from my experience with DSM's I have found that some electrical problems, are not reversible once done. I don't know why.
I would say a fuse, either under the hood or in the passanger compartment, but if you checked that I really don't know what to tell you.