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Old 05-09-2014, 01:23 PM   #2
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City: Dayton, OH
Join Date: Apr 2013
Posts: 206
Working on control panels that used LED lights we would occasionally see dimly glowing LEDs that should have been dark. The fix would have required installing diodes all over the place so we instead mentioned the phenomena in the operating manual. They can backfeed and light easily because they draw so little current.
If your light is incandescent, then you might have a problem, but LEDs can light (dimly) from tiny stray voltages or one ground being more negative than another ground, it's one of those little problems that pop up with LED indicator lights sometimes.
What exactly does your AC switch do?
I have no experience with the subtleties of marine grounding schemes.
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