"There are" a couple of useful diagrams in the factory manual that shows wire harness routing.
As Abodyjoe said, "most things" just fall into place.
There's only one harness with a 1/4" eyelet on a large gauge wire along with a green and blue with "push on" single connectors. This lays down and ends at the alternator.
The wiper harness only plugs into one of the bulkhead connectors --they are are keyed.
I recently used "part of" a Painless harness I bought "started to use" off Craigslist for I think 125 bucks. The damn thing is over 400 bucks new, and designed for a Chivvy!! Not impressed.