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Tower grounded?

Old 11-16-2016, 09:39 PM
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Default Tower grounded?

So I went night fishing tonight and instead of using the high draw spreader lights I clamped a led spreader to the tower leg, when I connected the positive to the battery the light came on.... Is this normal?
Old 11-16-2016, 10:51 PM
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the tower is probably grounded. the clamp on the light probably shouldn't be...
Old 11-17-2016, 07:46 AM
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Should I not use these lights and try to get a refund then?
Old 11-17-2016, 07:52 AM
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Weird, I thought I would get continuity between the negative wire and the light bracket but there's nothing...
Old 11-17-2016, 07:55 AM
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Ground is not meant to carry current, so I would return them or get replacements that are wired and function correctly.


Jim
Old 11-17-2016, 08:06 AM
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I don't know they seem to work just fine, I would have never known if I hadn't connected the positive wire to the battery first. I'm still confused on why this is happening... I would have assumed the case would be grounded, but wouldn't I get continuity then?
Old 11-17-2016, 11:35 PM
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The LEDs are bright because they are pulsed with a higher than normal voltage. The frequency is 'pulse width modulated' (PWM) from 100 Hz upto 50kHz using an LED driver.
This causes RF interference often picked up on am/fm radio. So I am guessing the housing of your LED light is metallic and should be bonded, not grounded. The reason they are powering up is most likely due to a bypass capacitor in the filter circuit passing the AC from the LED Driver via the bonding system which is probably terminated at the negative of the battery or engine. This capacitor blocks DC which is why you get no reading on a continuity tester, but passes AC current derived from the LED driver. Whether the light is faulty or not depends on the installation I suppose. Without knowing the brand hard to say.

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