Originally Posted by CallMeVilla
One outlet in the garage is dead.
A GFCI in the nearby downstairs bathroom is also dead.
Because of phantom voltages possibly fooling an electronic ohmmeter turn off all breakers.
BTW, I use an incand. bulb/battery continuity tester once power is off because it puts some decent current through the connections.
At least one of the three conductors in the cable entering one of the boxes almost certainly eventually goes to the load center hot, neutral or ground, so,
using an ohmmeter and a helper, completely disconnect this two outlet segment from each other and from the load center hot, neutral and ground and from whatever it's feeding downstream.
Then restore continuity between the two outlets (but check that the hot, neutral and ground for these two are wired correctly to the short slot, the long slot and the round hole).
Then run a new cable from the load center or some other convenient pickoff point to the GFCI.
There's an assumption in this procedure. Do you see what it is?