Sounds like a poor battery or ground connection. Check the connection at the battery or power source for 12 volts and check the ground from the generator to chassis ground.
These would be the first things I checked. Always check the free fixes first.
If you had an extra set of hands you could have someone check the voltage at the starter on generator, if it is possible, for 12 volts with a meter.
Good luck, Terry
2002 Monaco Windsor 40PKD. Marjorie 2.
2015 Equinox V6 Roadmaster tow setup
2019 ALP Adventurer 24DS for the short trips. April, 2021