I finally got around to adding anaother overhead light in my old furnace room above my battery and UPS system. There was one light and one switch in the room and it worked OK since I've been here (older 1970's house). I found the breaker and shut it off. Tested the light ect and no power. I unscrewed the fixture from the box and grounded each wire to the box to make sure they were dead (this is required in case you only used the switch to remove power, as I have seen people swap the black and white). I noticed that the wiring was not electrician quality (wires cut too short, they were switching the white wire and had the hot directly on the fixture). I thought I should fix that as I am adding two more wires to feed my second new light. I fixed it, and added the new wires and went test it. It no longer worked. I flicked the switch and heard that sound of a short circuit. Breaker tripped. Took the light switch apart and the guy had used a 3 way switch. He had all 3 wires Black White and ground landed on the switch. I put a standard switch in. I have seen bad wiring in the garage also. I wish people would ask for help if they don't know what they are doing. I make mistakes, but at a more advanced level.
