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Hi, this is most likely an effect from the converter charger needing replacement, are you plugged into shore power? Do you know where the converter is located in the unit? thanks
I cannot be sure, however if you could look at it, and give me the model number I can confirm if it is or not, thanks
My theory is that is is fluctuating voltage while in use. So when this is occurring (lights dimming ect) with your voltmeter, check the output dc voltage of the converter, if it does not stay steady, its bad. This is the unit that charges the batteries, as well as create the 12volt for usage when your plugged in................
The large black and red are the dc voltage going to/from the unit this is where you want to test.