Which are plus and minus leads from a Lionel 72 Watt DC power pack?

johnrr6OGR Forum Member

My multimeter is going nuts and giving me jumping readings in about the 13 volt range but never stays a solid reading. And I get the same readings attaching the probes to either wires. I simply can’t tell the polarity difference on the two leads after I snipped the barrel connector off.

I looked at the power supply and it shows that the inside connector of the barrel connector is positive.

OK….But then that makes no sense if the barrel connector cord that plugs into the power supply is reversible. And that cord can be plugged in either way.

I am trying to wire that 72 W power pack into a power distribution board. Haven’t worked much with DC. Does it matter in this case?

1/22/223:08 PM

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