Since the lights in your rig are 12 VDC, the dimming may be a function of the converter changing rates. I would get some help on it from your dealer, or at least make him aware of a potential problem. The converter supplies "recharge" to the battery, which is driving your lights.

We once parked at the end of a circuit that was put in to supply flea market vendors electricity for their RVs. The wiring for the circuit ran about 400 feet from the breaker box, there were 10 vendors using the circuit. At one point in the evening after all of the vendors had closed up for the day and were fixing dinner, watching TV or whatever else electrical devices were being used, our lights dimmed to the point where it looked like we were using candles. The TV wouldn't come on. These were the 110v lights in the TT so we had to switch to the 12v lights. This was before converters and inverters were common in RVs.

With our current RV (converter and inverter equipped) I will occaisionally notice the lights dim for a quick 1/4 second when something with a heavy draw kicks on like the A/C or microwave.

If the lights stay dim for long periods of time, then I know a breaker for the converter or inverter (depending on shore power or battery power)has tripped usually due to an overload condition. Once I reset the breaker the lights perk back up and I remind my DW not to run the washer and dryer at the same time.

-- Edited by The Bear II on Friday 6th of January 2012 12:29:20 PM

It can be the conveter/charger cycling keeping your battery topped off. If it is happenning with 110volt-AC lighting then I would start at the breaker panel. With everything turned off AND the RV unplugged from any shore power, check the tightness of the wire lugs on the breakers , anywhere a screw holds a wire in. A loose connection could cause this.