Our microwave isn't on the inverter either. Somehow this conversation has taken a different turn. lol The question I had was that the 110 portion of the dogbone wasn't working and I wasn't sure why. It's not a big deal but the dogbone was expensive and I felt like it should work.
Is there ANY way you can post a picture? A link to where one can buy the 'dogbone' you have? I believe that this (picture below) is similar to what people are imagining you have - Like Donc13 posted before. I did not see your answer to his post.
You evidently have more. The post title reads "50 amp to dogbone splitter to 110 amp". I am
ASSUMING you mean 110 VOLT not amp. Correct me if I am wrong, please.
You also said
" It says on the 110 side of the dogbone that it won't work with a GFCI outlet. I will still experiment with other outlets the next time I bring the rig home."
Thats muddies up the water. This '110 side' ... is it a Male (prongs poking out to plug into something) or a Female (holes to plug something into) ?
I have seen warnings like that on things that plug INTO a 110V outlet, AKA 'Male' plugs, but not on female 110V outlets. A 50A to 110V adapter should have the ability to have a GFCI 'downstream' from it. So we need to know if the 110V outlet is Male or female.
I can't seem to get anything to work with shore power connected to my house with a dogbone splitter to household 110 amps.
From your first post.
Assuming again you mean 110 VOLTS not 110 AMPS... 
This quote would make me think you have your 50A shore power connected to your 110 volt circuit, with an adapter like this:
I have read here that a 2552 is a 50A coach, with 'most everything' on one leg, and the second AC on the other. (PLEASE correct me any other 2552 owners!)
It is possible that the adapter shown above only powers one leg of the 50A outlet. Dunno. But if that IS the case, it may be powering only the 'second' leg and the second AC. Nothing else. AND that would have a label that states that you cant use it on a GFCI outlet. Thats TWO clues that match.....
50 amp power at the commercial building is working as it should and is not a concern. I'm just wondering if my fancy $70 dog bone could be the problem when attempting to go from 50A to 110 at my house
OK, so does that mean you DO have a 50A shore power cord on your 2552, and when plugged into a 50A outlet where it is stored, all electrical works in your coach?
OR does it mean what you say - The 50A power (outlet) itself is working.
And "attempting to go from 50A to 110 at my house" means you have a 50A outlet in the house, and you are attempting to convert it to a 110V receptacle.
Or maybe you mean the opposite of what you typed. - You HAVE a 110 Volt outlet at the house, and you are attempting to connect your 50A shore power cord to it through your dogbone adapter. Maybe? Like using an adapter I showed second, with the 3 male prongs on one end, and 4 female holes on the other end.
SO... Let me see if I can 'diagnose' this one. Are these assumptions correct?
1) You have a 2552, with a 50A shore power cord. This cord operates the coach electrical systems at your storage location, plugged into a 50A outlet.
2) You bought an adapter, dogbone style, that allows you to plug a male end into the 110 VOLT (15 AMP) service at your residence. This then leaves you with a 50A female receptacle that you plug the shore power cord into, so you can power up the coach when at home.
3) Plugged into the 110V outlet at the house, with that adapter, 'nothing' in the coach works.
4) When seeing if anything worked in the coach, using the adapter, you never tried BOTH the AC units.
If these are all correct, try the 110 adapter again and try
BOTH AC units, one at a time. If only ONE comes on, then the adapter is supplying only one leg of the 50A receptacle, and not the one that powers everything else.
How did I do?
