My generac 40g rv generator will start fine but no power. I noticed that when it starts the microwave will power up for just a second. I can turn the generator off and on a couple of times and then it will power up. Whats up with that?

Usually the generator will shut down if the ac is not present coming out of the generator. You stated that it still runs but no power on the output. Check your breakers first to make sure they are working properly. Depending on what board you have you can check to see if ac is present getting back to the board as well. If your board does not have this then they are using the frequency as a safety disconnect feature. That would lead you back to the regulator or loose connection or..dirty slip rings if this unit has brushes.

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Cleaned and adjust carburetor per Repair Manual. then adjust governor repair manual and should take care of problem on this old generator.

https://www.generator-parts.com/manuals/generac-rv/051834.pdf

Usually generators that have stood for a very long time loose the magnetism in the ignitor coil magnet. With care, if you can find the low voltage wire into the generator 'motor' you can apply a 9v battery briefly to it and spark it into life. Use the generator if you get it generating, for a good period and don't leave it unused for a long while.
*IF YOU DONT KNOW AND UNDERSTAND ELECTRICITY DO NOT TRY THIS. GENERATORS CAN KILL*

What is the wattage of the hair dryer?. It sounds to that your hair dryer is drawing to much power for the generator.

YOU NEED TO AJUST THE FUEL MIX ON THE CARBURTOR

Good troubleshooting on your part. Was my thoughts that the onboard battery had failed.

Check for low oil or over temp.

check the oil sensor circuit. I know when I take out or short out the sensor ckt on mine, it'll keep on running. low oil isn't good for any motor.

Replaced with different microwave. Amanna microwave works fine on both circuits. Would not recommend Whirlpool for RV use.

Thanks