Greyhawk GFCI Breaker issue

[Michael Q]

Hello, I recently purchased a 2020 Greyhawk and have run into my first issue requiring guidance from this forum.

On our last outing I discovered all outlets associated with shore or generator power ceased to provide power. This would include one outlet in the bedroom, the bathroom outlet, the dining room outlet and the pop-up tower outlet on the kitchen counter top.

My investigation found a Murray MP-GT2 GFCI breaker in the fuse box was tripped. Upon trying to reset the switch I found it would kick off as soon as I pushed it to ON. I ordered a new switch (2 actually, one to have as a spare part) and installed it. I still get no power at the outlets but the breaker does not kick off any longer, so I feel pretty comfortable the switch needed to be replaced as a piece of the bigger puzzle.

When I check voltage on the other breakers in the box I find they all read 120.
https://www.jaycoowners.com/forums/a...1&d=1637707041

All of the connections at the neutral bar reads .168.
https://www.jaycoowners.com/forums/a...1&d=1637707041

The White wire from the GFCI breaker reads .166.
https://www.jaycoowners.com/forums/a...1&d=1637707041

The reading from the Black wire is .355.
https://www.jaycoowners.com/forums/a...1&d=1637707041

I get the same readings from both new circuit breakers.
I screwed all the wires in tightly and in the same manner I took them off the old circuit breaker which worked for a few months.

Any guidance you can give me will be greatly appreciated.

[PaulB12]

Since you know how to use a meter, I'd start at
the source and trace back to where you lose power.
In my experience breakers rarely go bad, now gfics are an exception.
Is the main tripped? Do you have 50 amp, you may have lost one of the legs.
Do other 120v outlets have power?

PaulB12

[Michael Q]

Thanks for replying PaulB.
My motorhome is a class C 30 amp with 4000 generator.
I am getting power to other outlets and appliances (i.e. Refer, microwave) so I know the main (nor any of the other breakers) are tripped.
I believe the only outlets I am not getting power to are associated with the GFCI because they are near a sink or on the back wall of the bathroom.
In following the current, I get stopped at the circuit breaker because I have power running in from the neutral bar but nothing going through. I triple checked my connections to insure everything was tight and secure. I even cut the ends off and striped back the coating on the wire to expose newer unscratched or flattened wire before I screwed it into place on the breaker switch, neutral bar and ground bar.
I'm perplexed!

[Parrott]

You need to start at the outside receptacle and disconnect it and each receptacle on the line. Probably have a bad receptacle somewhere. The ones outside are prone to corrosion and shorting out.

[Parrott]

Looking at your pictures, do you have 120 from the neutral to the black wire when the breaker is plugged in?

[Michael Q]

No I have .355

[PaulB12]

Ok, I call bad breaker....
Take a known good breaker from your panel and attach wires to it from the bad(?) breaker. Tell use what you read. If the same I'd suspect a bad hot post on your panel.
PaulB12

[poohbear]

I must be blind , where do you have the black lead of meter ? On the neutral bus or the gnd bus ?

[Vicr]

You aren't troubleshooting properly. You must have the breaker connected to the bus bar (installed) and the breaker closed (on) to start troubleshooting.