robbarnes1965 wrote:Ok Russ, you peaked my curiosity. How do I switch from red to white or back?
Can I do this from a switch on the panel? At best I will have to dig through my sailboat wiring book - I have very little experience with electrics other than plugging in the leds backwards to get them to work.
You already learned that LEDs don't light if polarity is reversed. Diodes only allow power to flow in one direction.
So you wire 2 LEDs, 1 white and 1 red each with the polarity opposite inside each fixture. On "normal" the white lights up and not the red because the red is "backwards". When you reverse the polarity at the panel, the red is "normal" and white is backwards so only the red lights up.
You don't need a wiring handbook, just a little simple wiring knowledge. If you don't have it, find someone who does. It's not that complicated. A whole lot easier than running another set of wires to the fixtures.
At the panel (or someplace near it), install a DPDT switch (like this one
) so that when wired properly reverses the + and - wires. This
is the diagram I used to wire my steaming/anchor lights. The "D" in LEDs is diode so the diode in the diagram isn't necessary.
This is a great trick with any LED to save doubling wires when both are not needed simultaneously.
Switch wiring. Center wires are DC in from panel switch, left is out to LEDs (fixtures/mast lights).
This is exactly how I wired my mast lights.