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Thanks folks.
I have LED's and the lights are already at the top of the guide posts. The issue is in the wires and the salt air and sunlight. Every thing down here corrodes just sitting in the yard no matter how well you seal the connections. My place has a constant breeze off the water, today it's blowing about 40MPH driving all that moist salt air everywhere. Also, since I don't trailer the boat, the trailer sits exposed to sun all summer while the boat is on the lift. My plan was to rewire the trailer including a dedicated ground wire for each set of lights. I figure if I run tinned marine wire, in a jacket thru flexible tubing it just might last.