Why is it not working? are you burning them out? Don't believe the package when they state for 12V or 3V or what ever. You need to use a resistor with each one.
http://led.linear1.org/1led.wizhttp://home.cogeco.ca/~rpaisley4/LEDcalc.html
Use one of the above to help figure them out. Also, LED will only work hookup the right way. Try reversing the connectors, if you hear a pop or see a flash, its to late! Led's cannot take a over voltage, more resistor is better then not enough. I have burnt up a bunch of them so I am getting pretty good with them. Joe
