Here's the basics needed to set up your LED lighting
http://www.imagespeech.com/out.php/i193_BuildingLEDLights1.jpg

12 LED's Wiring Diagram
Notice that NO load resistor is needed. . Also notice the Anode and Cathode connections. The Anode is the LONGER lead. The LEDs MUST be connected in series, NOT in parallel.
NOTE: If using a light up switch connect the 3rd connection on the switch to ground.
http://www.imagespeech.com/out.php/i194_BuildingLEDLights2.gif


Multiple LED's Wiring Diagram
Notice that NO load resistor is needed. . Also notice the Anode and Cathode connections. The Anode is the LONGER lead. The LEDs MUST be connected in series, NOT in parallel.
NOTE: If using a light up switch connect the 3rd connection on the switch to ground.
http://www.imagespeech.com/out.php/i195_BuildingLEDLights3.gif


Similar LED Wiring Diagram
Here's a similar LED wiring diagram showing 4 seperate LED's (NOT connected). Notice the load resistor that IS needed for each LED. For LED/load resistor information check out THIS SITE. . Also notice that the Anode on the LED is connected to positive. The Anode is the LONGER lead. NOTE: If using a light up switch connect the 3rd connection on the switch to ground.
http://www.imagespeech.com/out.php/i196_BuildingLEDLights4.gif


LED Wiring Diagram
Notice the load resistor that IS needed. Also notice that the Anode on the LED is connected to positive. The Anode is the LONGER lead.
NOTE: If using a light up switch connect the 3rd connection on the switch to ground.
http://www.imagespeech.com/out.php/i197_BuildingLEDLights5.gif