I do not know how yours is set up, but on my three stage converter/charger, it occasionally goes to 14.4 v charging and that interior lights really brighten up. I have a meter for volts that I can see so I know that my battery voltage is not low when this happens. Might be your case also? You might look at voltage before and during to see if yours is doing the same. I have an inexpensive Vector 12v LCD voltage meter that plugs into one of the outlets for a 12v TV and can monitor voltage from there. Hope this helps.
1993 Gulfstream Sun Voyager DP 30'
200 HP Cummins B5.9, 4sp Allison AT542
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