With the receptacle without any power and the red light on, you can start by checking the “RESET” button on the receptacle to see if it’s protruding above the “TEST” button. If it isn’t, press the “TEST” button to intentionally create a ground fault and trigger it out. With ...
all of the receptacles are connected "end to end" and pairs of terminals on each receptacle are used to carry current from each device on to the next one in the circuit.
How to Ground an Outlet Older homes often have two-pronged receptacles (sometimes referred to as outlets) that should be replaced with a Ground Fault Circuit Interrupter (GFI or GFCI) receptacle. Some newer houses may likewise have a receptacle... ...