Mast wiring quandary - Page 2 - SailNet Community
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post #11 of 16 Old 11-10-2011
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Used my Davis light for 10+ years and agree with all the positive comments. Rarely turned on the installed anchor light.

Harry
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Cranes Creek, VA
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post #12 of 16 Old 11-10-2011
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Beth?
"I am adding an anchor light to the mast of my 1975 C&C25. There exists a masthead light and foredeck light,"
Is that masthead light a white all around light, as in an anchor light? Or do you mean it is a red/green nav light set?

If I remember correctly, there are some schemes using 3 wires for 3 lights, so you would not have to change the cable or connector. The trick is that they add two diodes to one of the hot wires going to the masthead and use a switch to reverse the polarity on that wire, so that when it is fed one way, it powers one light. Fed the reverse polarity, and courtesy of the diodes up top, it power the other light instead. (i.e. one way, the nav lights. The other polarity, the anchor light.)

Offhand I don't remember the details, only that there IS a fairly simple way to make that happen with a couple of diodes and switches.
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post #13 of 16 Old 11-11-2011 Thread Starter
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This is why I posted here. The idea of hanging a light from boom (in my case most likely from the split back stay) never crossed my mind! I purchased an LED anchor (Bebe Owl)light from www.bebe-electronics.com. It even has a hook to HANG it with! DUH Thans everyone for your input. Now to upgrade the remaining lights with LED's..

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post #14 of 16 Old 11-11-2011 Thread Starter
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Hellosailor,
Great idea, also. I sketched it out on paper and it makes sense. You would use a DPDT switch with pos and neg leads wired to one end, reverse them on the other and the switched terminals go forward tothe mast. this switches the "common" and "power" polarity. As for diodes, if you are using LED nav lights, your work is done, simply wire them opposite each other, or, like you say, insert diodes to block one or the other light from operating. the spreader light switch must be after the reversing switch, or it will not work under all conditions. Thanks everyone!

Norm
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post #15 of 16 Old 11-11-2011
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Bethand Norm:

Bebi Electronics-Home of the Finest Marine LED Lighting Products on Sea (or Earth)! not bebe-electronics.com

Great site! Thanks for sharing.

Mobnets
1973 Chance 32/28 "Westwind"
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post #16 of 16 Old 11-11-2011
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. . . and courtesy of the diodes up top,

Sounds more like a cobbled up fixit - more switches, diode(s), etc = more future complications and potential breakdowns when least expected. You've got a 26 year old boat with a SIMPLE wiring system. C&C used copper 2 conductor wiring for each light (I think it was lamp cord) back then. If it hasn't been replaced it's due now. Mast is deck stepped and easy to pull down. Why not remove old wiring, pull in tracers at the same time, run in NEW MODERN TINED copper wiring to suit your plans and have 26 years more years of worry-free mast wiring? You can remake all the existing connects, install a real cool looking new deck plug, inspect the rig and all the hardware at the same time. And when you move up to something bigger the new owner won't be freaked by the better mouse trap you are trying to sell them on. Keep it simple
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