[bitplumber]

I have a 50 amp GFCI breaker in my main panel. this is for a sub panel in our backyard that has nothing connect to it currently. When I flip the breaker on it trips. I verified there was no continuity between the two black power wires. I disconnected those from the breaker And so the only thing connected to the breaker at the main panel is the neutral wire and the pigtail that goes to ground. When I turn the breaker on it still trips. Is this breaker bad?

 

[surferdude2]

I'd remove it and clean it up good. If there is any crud on the terminals, it could be faulting to ground. If no joy then, it will need replacing. I suppose there is a good reason for having that type of breaker on sub panel feeders???

 

[seharper]

I would expect 90% chance the problem is a ground fault at the other end of these wires. Although you unhooked hots, neutral is still connected and that can ground fault too. I would unhook neutral.

If it still trips, then I'd clean up the breaker good and plenty and see if that clears it. There is a lot of dirt getting into that panel; see if you can address that. Dirt + moisture = leakage.