Wired my shop up myself about 10 years ago, and all has been fine. Wired outlets in the ceiling for plug-in florescent lights that are wired to a wall switch, and wired the wall outlets to a separate circuit. Three weeks ago, I pulled all of the florescents for some Harbor Freight LEDs. Things were bright, and worked great. Until now. Now they either don't come on, or are barely visible, with occasional pulsing. But the interesting thing - if I fire up a grinder plugged into the wall, the lights come on. Was running a fan a few days ago, flipped the wall switch, and the fan died, and wouldn't come back on, switch on or off. Plugged in the grinder, hit the switch, and lights and fan on. WTF? Maintenance guy at work said it sounds like I have a neutral loose somewhere, but all connections in the box at the shop are tight. It has 3 main breakers (I know): one at the shop panel, one outside of the house, and one in the main panel at the house. Any ideas on what I should check? Do the breakers possibly get weak, and can cause that? I might be having to call someone who knows what they are doing. Thanks for any help.