Welcome aboard John. There really isn't a lot of wiring on a 196. You'll have the nav lights, the bilge and the engine wiring. Form the battery(s) to the helm you'll have a fused (or CB) + and a - to a terminal block in the console and then anything that needs it gets it from those.
We've been asked before for a schematic and if found, they are very generic.
We have owners manuals in the Resources forum - maybe that'll help you (they are pretty generic also)?