pete wrote:
Hi guys, I'm just about to buy the nav lights for my 34 sailboat and
need a bit of advice on tricolour lights.
I reckon that the higher the nav lights the better and although none
of my previous boats had masthead tri colour lights I want to fit
those on my new one.
BUT I'm a bit confused about the use of what is advertised as a
combined tri/mooring light.
snip

The Tri-Color is a sail only light located at the top of the mast.

The mooring light is also usually located at the top of the mast and
requires a separate circuit.

When you are under engine power, NONE of the above lights are used.

A white "Steaming light", usually located about half way up the mast,
a rear white light as well as red and green lights, usually mounted
near deck level, are required, again on a separate circuit.

I used a couple of 3 pole, double throw panel switches that were wired
to cross interlock them.

You could have either the Tri-Color or the "Steaming" lights, but not
both.

The 3rd pole on the switches was used to control the red back lighting
used at night on the compass and other instruments.

HTH

Lew