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Success..... I hope....due to intermittent nature of problem....I won't be sure for a while. Closer inspection of the float revealed a section of cable that had rubbed to bare wire where it disappears inside the frame of the float pretty close to the plug...where there is a lot of movement - as mentioned by Cuppa. Also found another place in danger of similar problem...so it has been sorted too. Thank-you all for your many suggestions. I will gradually replace standard lights with LED versions. And I now know that I need to add cable and plug inspections to my regular trailer maintenance. Thanks again.