If my amp has one connector for power and one connecter for cap.. how should i wire it then?
i do have a cap.. do i need two wire from the battery?

 

Some of the Audison amps have this and this is what it's for.
The cap input is a direct connection to the power supply section after the internal fuse to get maximum efficiency.
You have to have a sufficient power wire direct from battery/distribution block into the B+ terminal.
If you want the most out of the amp, connect the cap directly to the cap input. If you want to save wire you could use the cap as a distribution point and run them both from there.