hey there, i am an electrician, if you think it is electrical, not only turn the breaker off for the dimming lites but the rest of the breakers that you do not need(furnace,fridge sump pump). the first thing i would do is look at the lite fixtures and make sure you do not have to big of lamps in them. very important!!! if lite doesn't say what size, use 60 watt lamps. good luck