DC Adapter Question (Negative / Positive)

[FooserPaul]

Hello all!

Is the wire with the white stip positive or negative?

Paul

 

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[FooserPaul]

After testingwith two test pennies...

One way turned the penny silver... the other did not :-)

Easy enough way to test...

Paul

 

[sqwaby]

Plug it in and test with a volt meter. If the red lead is connected to the positive output you have a positive volt reading.

 

[sniffer]

the lead with the stripe is the positive lead