[hiccup]

The reverse polarity/available lights only last so many hours 'on'. So, the sore power 'available' light, which is 'on' for hours on end during the season, tends to get dimmer and dimmer over the years and can start to flicker even when things are 'ok'. Tiara typically used Solico 3450-4-50-19314 for this light and it is easy to replace, although be aware it has live AC to it when plugged into shore power/generator on/etc.

There are shorepower wiring problems that can cause the light to flicker, but most likely (especially if it is dim), the problem is with the hours on the bulb. You could trying swapping the generator light for the shorepower to see if that fixes it, then buy the replacement.