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Hello George and welcome aboard WhalerCentral.

There aren't any schematics for the Classics as wiring the boat up was left up to the dealer or the owner depending on what equipment they installed.
Here is a generic wiring schematic:
http://www.whalercentral.com/download...?cat_id=11

There are basically 2 separate wiring systems on smaller boats.

1. Engine wiring harness.
(not much we can do about this except take care of it)
http://www.whalercentral.com/articles...icle_id=72

2. Accessories wiring including Navigation Lights
This is basically setup using a negative and positive ground from the battery running to a fuse/buss panel in the console.
From there, all your accessories are connected to that panel similar to this one.
http://www.whalercentral.com/photogal...oto_id=793

Enjoy your new to you Montauk.