some electricians use a multimeter to ohm out (or verify continuity) and then they figure out what goes here, but the colors are also sometimes a clue and lastly, you need to give a specific make and model boat.
I found older wiring here:
http://retrocrestliner.com/phpBB3/viewtopic.php?f=2&t=1353
https://www.google.com/imgres?imgurl=http%3A%2F%2Feastblu.info%2Fcache%2F4%2FBingimages_57126.png&imgrefurl=http%3A%2F%2Feastblu.info%2Fboats%2Fboat-wiring-diagram.html&docid=g0RJETx8yo09pM&tbnid=m9uYB0Xoo-Xk0M%3A&w=864&h=674&bih=1044&biw=1920&ved=0ahUKEwjF7bzVgvbMAhWCxYMKHfMGDOcQMwgeKAIwAg&iact=mrc&uact=8
and a forum where som eoe may have it to post for yu:'
http://forums.iboats.com/forum/engine-repair-and-maintenance/johnson-evinrude-outboards/112163-1960-40hp-johnson-seahorse-wiring
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