I have a detatched garage. I started my small air compressor and the power was cut off, as if the circuit breaker
had tripped. It hadn't, but I was still without power. The garage is on a 20 amp breaker with 2 romex cables entering the garage via an underground conduit
. I replaced the breaker having had a spare, with no change. There is a gfci outlet
upstream of 2 other outlets and a light switch
which I also replaced, having a spare. Still no change. There is an outside wall light on the garage, controlled by two 3 way switches, one in the garage and one in the house, and that DOES work. Where the 2 lines enter the garage there's a junction box
with 4 wire nuts connecting the hot and neutrals, and one connecting the grounds. Using a common outlet tester with the orange led
light, when testing between the hot and neutral (black and white) connections, only one neutral connection failed to light the test light. I've also redone all the connections downstream of the house panel, and those within it that I can access. The load line in the garage passes through a triple switch box, and I've replaced the two simple switches but not the 3 way (didn't have a spare handy). I'm stumped. Help!