Where can I get good, detailed wiring diagrams for my car?

I'm trying to diagnose my inoperable cooling fan on my 2003 Mercury Marauder, but I need the specific wiring diagram for the circuit. The haynes manual dumbs it down too much and every other source gives me the runaround. I looked into alldata, but was unpleasently surprsied with their prices. All I need is the stupid diagram so I can finally fix and put this headache behind me. Anybody know where I can get what I'm looking for?