Which Is Which???

Discussion in 'Getting Started' started by msh, Jul 9, 2002.

  1. msh

    msh Member

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    Simple question - how does one determine which connector on a DC power supply is positive if they are not marked? I've a tester, just don't know how to use it for this.
  2. Woodie

    Woodie Active Member

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    MSH. It depends. If it is just a powersupply (not controller) and it has wires connected, the wire with the "white stripe" is the positive lead. If it has "lugs" or "screws", then, using a multimeter, the "red" wire on the multimeter is positive, black is negative, and you have it the right way round when you get a "postive" reading from the lugs.

    If it's a controller, then it doesn't really matter, as the polarity will be reversed when you switch directions.
  3. billk

    billk Active Member

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    You would get more meaningful answers if you would only post the question in one place (per forum).
  4. alkcnw

    alkcnw Member

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    I really like a good CURMUDGEON!!!!!!!!!!:eek:
  5. billk

    billk Active Member

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    It's a dirty job but somebody has to do it.