I have a single light controlled by a switch in my garage. It's really pathetic, so I decided to add some shop lights to the same switch.
Upon opening up the light wiring box, I found not 1 but 4 sets of wires coming in. And I was adding a fifth! Turns out this circuit continues to various other parts of the house.
Anyway, I added the new 14GA set, and wired up a new outlet to plug my shop lights into. Plugged them in, and presto! On they turn. Success!
Except when I turned the switch off, the old light turned off, but the new shop lights did not.
The current wiring setup is there are 5 sets of ground, all together and connected to the ground screw; 4 sets of black all together with one white; one black going to the light; the remaining white all together, with a patch wire coming from them and going to the light.
I'm somewhat handy with the electricals (at least that's what my electrician said!) - I just can't figure out what I did wrong.