Warning Alarm Wiring Diagram For Boat. A view of the connection end of the alternator can be seen in this picture. Black dust around front of engine.
Older boats may well have a rising oil pressure switch that sends this current to the rotor as the engine starts especially if it has no ignition switch and a push button start. The vast majority of recreational boats in service today are still using analogue instrumentation systems. There should only be a purple and a tan attached to your warning horn.
All three are ok.
Wiring diagrams page 2d 10 90 884822 december 2001 shallow water alarm feature you can set an alarm to trigger whenever the boat moves into water shallower than the alarm level. When i bought my boat 2 years ago the warning horn was missing. The yanmar replacement was expensive so i made my own. Both are hooked together.