The short answer is, you need a GOOD wiring diagram for your car, and you really should buy either a reprint (paper) or a CD version of it. I mean Chrysler, not Haynes or Chilton, etc
But you can download a 66 manual on the site 'fer free, which might be close enough. The page numbers do not follow the original, so you'll have to play with 'em a little to find stuff