Polarity of LED lights - SailNet Community
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post #1 of 5 Old 07-27-2013 Thread Starter
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Polarity of LED lights

Hi all,

Just rewired the mast. Changed all lights to LED's. On the instructions, and in "This Old Boat", they mention making sure the polarity is correct when wiring. I do have a new digital multimeter. However, when checking, I don't notice any difference when reversing the meter prongs to the red and black wires of the new lights. Supposedly, you get a (minus) - if it's backwards. Should I just go ahead and connect the lights, red/hot, black/ground and try them briefly (the mast will be down). Expensive lights, don't want to burn them out needlessly.

Thanks!

Chris
Pasco, Wa.
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post #2 of 5 Old 07-27-2013
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Re: Polarity of LED lights

You'll be fine - just connect and go.
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post #3 of 5 Old 07-27-2013
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Re: Polarity of LED lights

They should be diode protected against a reverse voltage any way but yes, red = hot (+), black = ground (-)
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Re: Polarity of LED lights

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Originally Posted by budvar View Post
However, when checking, I don't notice any difference when reversing the meter prongs to the red and black wires of the new lights. Supposedly, you get a (minus) - if it's backwards. Should I just go ahead and connect the lights, red/hot, black/ground and try them briefly (the mast will be down). Expensive lights, don't want to burn them out needlessly.
Chris:

You can't hurt the lights by wiring them backwards but if they aren't connected with the right polarity they won't work.

Apply 12V to the lights and see if they do. If they do note the polarity of the voltage. If not reverse the polarity of the voltage. Mark the wires. Then make sure the polarity is the same when you raise the mast.
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post #5 of 5 Old 07-28-2013
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Re: Polarity of LED lights

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Originally Posted by jimkyle99 View Post
They should be diode protected against a reverse voltage any way but yes, red = hot (+), black = ground (-)
They aren't "diode protected" - they are diodes
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