Re: Wiring diagram for1978 ranger boat
I will go out on a very short limb, and guess that it's extremely unlikely such a thing exists in any official capacity.
A generic boat wire diagram may be of help to you, and actually be possible to find. How many electrical components could such a boat even have anyway? I know my '72 Starcraft had a something like; the bilge pump, running lights, and the ignition switch...