Things You'll Need
Transformer
Wire connectors
Electrical pliers
Wire nuts
LED lights are designed to operate on low-voltage direct current similar to that supplied by batteries. To wire LED lights to 120-volt household current, a "step down" transformer is required to convert the alternating current into the lower voltage direct current. While there are sets of LED light that are pre-wired with a DC transformer that is simply plugged into a 120-volt electrical outlet, for customized light installations you must wire a transformer between the LED lights and the 120-volt power source.
Step 1
Shut off the power to the 120-volt circuit that the LED lights will be connected to.
Video of the Day
Step 2
Insert the end of one wire coming from the LED lights and one wire coming from the DC side of the transformer into opposite ends of a wire connector. Fasten in place by crimping the connector closed with the pliers.
Step 3
Insert the remaining wire from the LED lights and the remaining wire coming from the DC side of the transformer into opposite ends of a wire connector and crimp closed with the pliers.
Step 4
Attach the hot (black) wire on the AC side of the transformer to the hot wire of the 120-volt AC circuit by inserting the ends of both wires into a wire nut. Twist the wire nut onto the wires with your fingers until tight.
Step 5
Insert the end of the neutral (white) wire from the AC side of the transformer and the end of the neutral wire of the 120-volt AC circuit into a wire nut. Twist the nut tight with your fingers.
Step 6
Turn on the power and test the lights.