check polarity of a DC power plug

osqzxxgfduxb - 2 years ago

You don't have a voltmeter. Do you have a potato?

With the power adapter unplugged from your electrical outlet, cut the wires, strip a little insulation from the ends, twist the wires into a point. Do not allow the bare wires to touch each other from this point on.

Cut the potato in half. Poke both wires into the cut face of the potato about 2 cm apart. Plug in the power adapter to the wall outlet. In a short time, the potato around one of the wires will turn green. That is the positive wire.

Unplug the adapter and clip off the ends of the wires so you have clean wire for soldering your new plug.

Original from: https://diy.stackexchange.com/questions/252038/is-white-wire-with-grey-stripes-positive-or-negative-wire/252050#252050

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(I already have an account)

ydwpwnagtpjm - 2 years ago | thread

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