As you can see, I am new to the forum. In fact, I just purchased my 2002 4.6is three days ago. Unfortunately, the second day owning the car my regulator failed as well. I took it to the dealer and it costs approximately $410 to fix. Not an expense that you want to incur after only owning the vehicle for two days. Best of luck with yours. There is a good DIY link on this website with pretty good instructions.