Every time I buy a car/truck, I go to the web and buy the factory service manual. (owner's manual is nice, but it doesn't help with repairs) To me they're better than Chilton or Haynes, and always include full wiring diagrams with connectors, splices, everything electrical. Vacuum lines, too, and the proper way to remove/replace parts. I've always used www.books4cars.com , but there are many vendors to choose from. Get one before you need it, it'll save you money and times for years to come!