Power Capacitors

[saxo_boi]

I have tried to fit a power cap to my audio system in my car but ive got a porblem and that is that it just stays on constantly and doesnt go off, is this right? ive heard that you can fit a remote lead so that when the car is turned off then it sill also turn off. i have had a look at the top of the power cap and there is a little piece of metal with a hole in it so i tried to wrap the remote lead around this as it says that the remote lead should come from near there in the instructions but they are very vague and not clear at all. Also is it possible to have a power cap when you have more than one amp? Thanks for all your help in advance