50 AMP circuit breaker

Yes. Replaced one last year on the pedestal where we were camp hosting.

Yes but first try flipping it on/off ten times. If this gets it to work, it still needs to be replaced.

Yes, portion of the interior can go bad and the handle remain in the on position.
You can reset many by turning off all branch breakers then turn off main breaker applying light pressure toward off. Then turn the main breaker on, then each branch breaker one at a time.
Another item that could be suspect is the transfer switch. Verify that you have in deed lost incoming power to the main breaker by using a voltmeter. Turn off main and read each leg and across main breaker. Each leg to ground and neutral should read 120 volts plus or minus a couple volts. If shore power is correctly wired you should read 240 between the two legs.

Have you tested the 50 amp circuit for 120v at the power pole?

Have you tested the shore power cord for 120v at the coach end when plugged to the pole?

Have you measured for 120v at the inbound terminals to the breaker?

Are all the breakers on your inverter reset?

deandec wrote:
Have you tested the 50 amp circuit for 120v at the power pole?

Have you tested the shore power cord for 120v at the coach end when plugged to the pole?

Have you measured for 120v at the inbound terminals to the breaker?

Are all the breakers on your inverter reset?

Exactly.

wolfe10 wrote:

deandec wrote:
Have you tested the 50 amp circuit for 120v at the power pole?

Have you tested the shore power cord for 120v at the coach end when plugged to the pole?

Have you measured for 120v at the inbound terminals to the breaker?

Are all the breakers on your inverter reset?

Exactly.

X2 and I'm even guessing that that the breaker is tripped, while appearing to be on and the handle loose to the touch.
As for the question of what can go wrong, the answer is anything and have seen industrial CB's with the contacts welded shut and even though the handle was in the off position. Ask me how I know and the one time, I was too lazy to use my meter.
Back to basics though and as said, one needs to first determine if power is present in the first place.

Thanks to all that have responded. I’m going to start with what works. I have two GFCIs in the coach. One on the bathroom vanity and the other one under the dining table. When I start the generator all outlets on the dining room GFCI work. The vanity GFCI ( new ) will not reset so there is no power to the outlets on that GFCI.

To deandec… yes to everything.
To enblethen ……244 and 122 at the breakers. All 50 - 30 - and 20 AMP breakers are on with 244 and 122 volts flowing thru.

I took the cover off the transfer switch. I had my wife start the generator while I am at the TS. I heard it “switch” and the green light came on. I shut the generator off ( already unplugged from shore power ). I turned the inverter on and I get no volts at the TS or CBs. I think we are getting zeroed in but the mystery to me remains why current flows thru the dining GFCI when the generator is on but not to the vanity GFCI ? Why no current to any outlets when plugged into shore power when all breakers read 244 and 122 ? TS is sending current to CB panel. Could the TS not switching to invert be the cause of all this?

Ivylog -

Thanks for the suggestion. That is the first thing I tried as it seemed the simplest. Unfortunately it didn't work.

You said the transfer switch clicks when you start the generator.
Does it click when you hook up to shore power? If it does not
you may have an energy management system, like I have in my coach, that will not allow shore power to the coach IF any of the following conditions exist:
NO GROUND
LOW VOLTAGE
HIGH VOLTAGE
NO NEUTRAL
REVERSED POLARITY
Just because you can read voltage at the power pedestal, that does not mean that your EMS is seeing everything as being correct. It will not allow it to switch to protect your coach from something that is wrong. Remember, this is what your coach is seeing at the end of the power cord, which may mean you have a defective cord and NOT a problem with the shore power outlet.

Do you have a large inverter? Check to see if the breakers are energized. Some have a small reset button with a white or red end.