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Wiring diagrams are huge, and expensive. Your first option would be to look in a Haynes manual and see what they have. Sometimes they are good, sometimes not, but the price is right. Your next option is to go to www.helminc.com and see if they have the factory diagram for your van. It won't be cheap, but it will have everything in it, and is what the dealership uses.
I think this is a very rare occurance, but I had a SVO mustang that was a half-year model. One part of it was wired like an 86, but I had the 85 manuals. The dealership actually let me look in their books, and they photcopied the one part that I needed for free. Of course this was only one sheet, and not the whole diagram.
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