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Posted: Mon Sep 16, 2013 5:28pm

Post Subject: Navigation light earthing

Dear Tony, I recently replaced a damaged navigation light. It had the usual +/- cables as expected, but the bulbholder was secured to the brass body by a brass strap, so there would effectively be a secondary earth point created at the bows! I wrapped insulating tape around the bulb holder, which isolated the negative feed, but I was concerned. Would there be a risk of electrolysis without isolating the bulb holder, bearing in mind that the nav lights are only used occasionally? Regards, Nick Ford


Posted: Mon Sep 16, 2013 6:06pm

Post Subject: Navigation light earthing

In theory yes but in practise probably not - no garuntees though. There are many narrow boats with either their horn, tunnel lamp or radio aerial "earthed" to the hull and by and large any discernible extra corrosion is rare. Although I would spend a little time, as you have done, trying to avoid it I would not worry overmuch if it was not possible. Tony Brooks

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