I waited for a technical thread to ask this question: where can DIYers that want to fix their own car get a manual with wiring diagrams, service bullettins, troubleshooting procedures without paying alot in subscription (hundreds per year)?
Haynes or Chilton manuals (they are the same company now). You can pick them up at auto parts stores, Amazon, or buy PDFs online.
They are based on the official tech manuals and only cover the stuff that is within reason of a home or small shop mechanic, and don't require you to have manufacturer specific tools in most cases.