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Does the light flicker while on generator? Please advise if light (LED) on generator, the 12 Volt lights inside the TT or if its the 110/120 Volt lights inside the TT.
Do you have a digital Volt Meter? If yes, this tool can be used to test both 12V and 110/120V "current flow". Good tool for diagnosing many different electrical situations as well.
On my setup (a few years ago), the 110/120 volts "light" flicker was because my "generator" wasn't running smoothly. Its engine would pulse up and down and its output voltage would change from 115 to 132 volts. After some diagnoses, I discovered its governor needed minor adjusting. It works great (at consistent 118 volts) now. Perhaps your generator isn't running properly either?