is the switch to start charging the capacitors? or is to connect the second capacitor?(if you have one)? the switch is rated for 12 volts @25 amps, but with the caps, they are charged to something like 300 volts, but at a low milliamperage (1-3)ma. if the switch is to replace that little metal thing on the bottom, it doesn't have 300 volts through it, only something like 1.5 volts, which then goes to the transformer, and then the transformer steps up the voltage to 300 volts