If one wire is always hot thats not the one you want. Turn the power back on.
How To Hang A Ceiling Light Fixture Family Handyman
Two hot wires to light fixture. Attach the chain to the screw collar then hold the light fixture up against it. Twist the ends of the two light fixture lead wires together. By max stout updated july 17 2017 connecting a two wire light fixture to a three wire power supply cable is not an ordinary occurrence. Three wire supply cables generally carry red and black hot wires of 110 to 120 volts each with a single white neutral wire. Use chain pliers or pliers with a screwdriver to open the link on the end of the chain. You want the wire thats hot when the light switch is on and registers zero volts with the light switch off.
The other black and white wires are the electrical circuit for the switch. You can wrap the wire around one of the screws that holds the fixture on but the only purpose it serves is to help hold the fixture up while you wire the black hot and white common wires. Adjust the length of the chain to the link that best matches your desired length. If you dont have a multimeter connect one of the non white wires to the black wire on the fixture. Twist the bare copper wire from the light fixture electrical box around the green screw located on one side of the strap. Testing electrical wiring can produce different results depending on the method so it is best to test each insulated wire to ground one at a time and then test between the two insulated wires typically black and white for 120 volts.
Thank you for your electrical wiring questions. Voltage readings for light fixtures. If the light can be turned on or off from switches at each. Connect the two white wires from the light fixture to the white wire located in the electrical box by twisting an orange wire nut onto all three wires. Never connect the fixtures ground wire to the white wire never ever ever connect the ground wire to the white wire. One of the black and white wires goes to the light fixture.
Connect the two black wires from the light fixture to the black wire from the electrical box the same way you connected the white wires. On a flat surface attach the adjusted chain to the light fixture.