I have 1/2 horse fountain with a time and 2 100 watts lights. I shut it down for a few days to kill some weeds and when i started it back up it popped the GFI. Now when I plug it back in it will run from 1 to 3 minutes and it pops the GFI. I have changed the plug in location and disconnected the light circuit and observed no improvement. The pump itself seems to be running smoothly with out restriction. Any suggestions?