I just got a new wiring diagram for my FIL's 450, and it came with every wire a different color so it could be easily tracked, every terminal numbered, and a couple of sheets describing where every number should go.
See my topic 3 posts below yours. The order of the posts in my topic is messed up, but you'll be able to follow it. When I first posted pics of my FIL's wiring, there was a chorus that mentioned Brillman, and I wasn't disappointed. He's easily available by phone, too, if you run into questions.
What might be pertinent is if it's neg or pos ground, generator or alternator, voltage regulator or not, stuff like that.
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