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Reply to "Powering Menards Building"

In the future, if anyone needs to determine if a wire is polarized positive or negative, you can use your DVOM to find out. Put the meter range on DC, in a voltage range that exceeds the expected voltage.

Put the red lead (+) on what you think is the positive wire from your supply. Put the black lead (-) on what you think is the negative supply wire.  If the display indicates either + or no polarity, the red wire is on the supply positive, and the black lead is on the supply negative.

If the meter indicates  a minus sign ( - ) then you have the red lead on negative, and the black lead on positive.

Last edited by Arthur P. Bloom
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