Oscillating lights

rickbird wrote:
Oscillates under shore power after a period of time with multiple lights on. 2006 Montana

Around 2007 on the way into Death Valley we were camping with friends in a new Monaco that was doing exactly what you describe; generator on with lots of lights, "oscillating" somewhere around 30-60 sec (don't remember), dim, bright, dim.. It turned out to be an under-rated auto-reset circuit breaker between the batteries and the charger.. I think it was a 40A breaker on a 60A charger that was simply too small. A trip to NAPA fixed the problem.

Mebbe you have something similar...