We have a working GFCI outlet in the basement near a tub that the washing machiner empties into.
We'd like to install an overhead utility light, controlled by an on/off switch, protected by the GFCI circuit. I figured one terminal of the on/off switch must be connected to BLACK LOAD on the GFCI and one terminal of the on/off switch goes to the light fixture. The light fixture's WHITE would return to WHITE LOAD on the GFCI receptacle. But this doesn't work. The GFCI always pops.
P.S. The GFCI trips as soon as power is returned when the breaker switch is flipped in the breaker box.
P.P.S. So, I removed the light fixture and the GFCI still tripped when power was returned from the breaker, and re-tripped when I pressed Reset. However, I tried moving the WHITE wire coming back from the (missing) fixture onto the Line WHITE connector, from its previous position on the Load WHITE connector. And now, no more tripping. The whites could be pigtailed inside the box --right?-- so this is not unsafe?