This is one of two (different) capacitors I have connected to a 2000 watt system and I have no headlight dimming so I suppose at least one of them is working and that this one is at least pitching in.It is advertised as a 10-farad capacitor but I don’t think there is any way 10-farads of capacitance could physically fit into anything that small. I have not tested it yet (thus it still gets a positive rating) but I am not convinced it is anywhere close to 10-farads.