Which Is Which???

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

  1. msh

    msh Member

    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

    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

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

    alkcnw Member

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

    billk Active Member

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

Share This Page