I ran switches to turn each amp on and off. I started by wiring the remote wire from the head unti through a relay so I was not drawing too much current. The relay powers a 12 volt source that acts as remote wire for 3 amps, powers 5 LED strips and 3 cross flow fans.
I used an bosch type automotive relay and used diodes to prevent any transient spikes when the relay closed after that power was shut off.
I split the output wire from the relay and ran it to seperate push button switches and then routed wires to the individual components. Makes for a lot of wires, but I wanted the control.
I find that most of the time when we are on the hook, I have th tower speakers on and the boat speakers off. The sub is often off when we are floating as well, especially if we are all in the water.