So I go to work on my Skimmer and get zapped!! Seriously!! So I test with the volt meter 120 volts...... I do the normal routine of unplugging one thing at a time. No change. After 3 or 4 attempts of going thru each pump, heater and lights, with no change I unplug everything. Still 120 volts. So now I start unplugging things upstairs in the DT. No voltage there.. Still no change in the sump. :squigglemouth: Next,, call Chriskid!! LOL He suggested to start flipping breakers one at a time. so I start doing that. After 3 or 4 breakers I get a reading of 156 volts!! Going the wrong way for some reason... Finally after about 10 or 12 breakers I get a reading of 1.4 volts...:angel: now to find what I turned off. After testing all the outlets around the tanks I find that one of my MH lights on the DT was plugged into a power strip on a lonely outlet on its own breaker. So I plug the power strip into the GFCI outlet and the power strip sparks and starts to smoke.!!!! NICE!! About an hour and a half of testing but at least I found it....