A different tack
New fixtures may be in order.
I have a 1988 E32-200 and when I went up on the mast to determine why nothing electrical was working I discovered the problem was not only the bulbs but the fixtures were badly corroded as well. In addition the lenses were cloudy so as to prevent just about any light from escaping anyway. So the I replaced both fixtures with new lamps. The steaming or mast head light is an inexpensive Aqua signal 25 series with built in foredeck light. What fun...just like the 42 foot Cabo Rico next door. I don't recall the details on the anchor light but it was an Aqua Signal as well. Now days there is probably a LED bulb for these lights if you are really serious about saving electricity.
Be sure everyone knows to tread lightly when you are up in the chair. My first inspection of the lamps was enriched by the Admiral stepping off the boat to take the "director of boat security", Lucille, for a walk. Talk about a thrill. Later I called Thumper my cardiologist and cancelled my annual appointment. I could tell after that excitement I wouldn't be needing him for a long while. <label for="rb_iconid_18">
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Larry Lee
Annabele Lee
Ericson 32-300
Savannah, GA