Many of the electrical questions asked on Motor Vehicle Maintenance & Repair could be much more easily and authoritatively answered with access to the wiring diagrams for the car in question.
I've had very mixed results searching online for wiring diagrams. What I've been doing is to search on something like:
<make> <model> <year> wiring diagram
audi a5 2012 wiring diagram
Sometimes I luck out, but often the results will be a hodgepodge of related and unrelated schematics. Any suggestions on how to improve the results or even on how to quickly determine if a result is actually for the car in question?
Also, I'd be interested in ideas for how to find the right section of the wiring diagram. For VW (at least) the wiring diagram spans many pages of the service manual, so it would be nice to have strategies for getting to the specific page that covers the circuit of interest.