GFI electrical question

[dogvetia]

I acquired a 2018 cruiser aire 28fd in October. Using it here in AZ this winter, I noticed that while using 50 amp generator power the bathroom gfi outlet which controls a couple more in kitchen area works great. When I switch to 50 amp shore power supplied thru a surge protector, this gfi outlet trips and cannot be reset. Taking the surge protector out of the system makes no difference. I installed a new 20 amp GFI outlet with same results. Since the power comes into the 5th wheel thru the same system I am stumped. Any thoughts or advice?

[dogvetia]

How would I ground to the shore power? I would think the 4 prong 50 amp cord would ground the unit??

[dogvetia]

I understand the not resetting unless powered and it was. Also does this on several different campgrounds. The comment on inverter was good but you would think it would do it on both generator and shore power. Not just the one. Thanks for relies

[Allworth]

GFI needs a hard ground.

Generator power is a floating ground. You are grounded to the generator, not the power grid.

[Retired_JSO]

I would suggest you check shore power outlet with a meter along with shore power cord.

[theoldwizard1]

GFCI outlets can not be reset unless there is power coming in.

[enblethen]

Check to see if you have an inverter feeding this receptacle.
Not being able to reset is a sign that there is no 120 volts AC to the receptacle.