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175 Osprey nav/anchor switch

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TopherMichael:
Might be a dumb question... but why is the nav/anchor switch a 3 position switch... I can either have the lights off (center position), nav lights on (up position) or anchor light on (down position). I am under the impression that I would want both the nav lights and anchor lights on at the same time at night. What I am missing?

Capt. Bob:
The "anchor light" doubles as the required "all around/stern" white light that is on while underway (along with the bow lights). You are also required to show a light when anchored at night but do not show the bow lights, hence the 3-way switch.

https://www.westmarine.com/WestAdvisor/Navigation-Light-Rules

TopherMichael:
Thanks... will have to test the lifts again.

TopherMichael:

--- Quote from: Capt. Bob on June 14, 2020, 07:03:59 AM ---The "anchor light" doubles as the required "all around/stern" white light that is on while underway (along with the bow lights). You are also required to show a light when anchored at night but do not show the bow lights, hence the 3-way switch.

https://www.westmarine.com/WestAdvisor/Navigation-Light-Rules

--- End quote ---

So tonight I tested the lights and either the anchor light is on or the bow lights are on, however, there is no option to have the "all-around/stern" and bow lights at the same time.

I am under the impression that both should on when underway at night. Right?

Capt. Bob:
Switch/wiring problem.

When the switch is in the "nav light" position, both bow and "anchor" lights should be lit. Often the anchor/stern all  round socket or the light pole connection is corroded. However, since your anchor light does light, that leads me to believe that either there is a wiring fault at the switch or a fault in the switch itself.

Here's a schematic of the wiring of your three way switch (download the middle .pdf file).
https://classicaquasport.com/smf/index.php?topic=9053.msg79505#msg79505

Review it and take a look at yours. You may or may not have a diode type switch (both types are shown). See if it has all the wiring intact and does not show signs of corrosion on any of the posts. You have to start somewhere.

Good luck. :thumright:

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