Quote:
Originally Posted by dpeterson3
If you aren't sure of the polarity, get your Ohm meter out. The center of the plug is always positive and the outside is always negative. Put the meter on one wire and the outside of the plug. If the meter doesn't read zero, switch wires.
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Not Always!
If the device has this diagram on it then yes it it center positive:
If the Diagram is:
Then the center is negative and the outer shell is positive.
It is always a good idea to check with a continuity or an ohm meter to verify you have wired the connector correctly.
...Forest