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Join Date: Jul 2006
Location: Kennett Square, PA
Best I can give you verbally is that the Bk/Y is your ground wire and should connect to the same ground going to your fuel gauge, acessory leads, cooling fan, and a bunch of other things; R/Y I believe is your high beam lead, and R/Bk is your low-beam (and should be the constant power once the engine starts up). The blue wire to your jbox should be bypassing the relay that sends power to the R/Bk once the engine's running.
The best diagram I have is in my Haynes manual, but I'm not sure it's something I can locate on the web for you. Anybody else have a Haynes and know how to capture the image and pdf it?