switch

i'm planning to put a separate audio setup at  the back of my pickup truck, can i put a switch to turn it on/off so that i can listen to the 2nd setup only when i want to? actually its a demo pickup truck.

what do you want contol over? amps, speakers, h/u, get a little more indepth.

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Run one remote turn-on wire to both systems.  Here's the wiring:

https://www.the12volt.com/relays/relays.asp

https://www.the12volt.com/relays/page5.asp

Instead of  "additional accessories" and  "fans" would be your various amplifiers.  Put a toggle switch in between system 1 and system 2, and run the wires and switch to whatever location in the truck you want.  You can toggle system 2 on and not affect the primary system.

You can use a toggle that will turn one system off and turn the other one on at the same time.  It would be wired before both sysems, with each system taking a side of the switch.  Everything would still come after the relay.

Or a toggle before each system, both after the relay. 

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

i'll be using just one headunit. just want a switch to turn on/off the subs, amps and speakers at the back of the truck.

You didn't get what I said?  The remote wire comes off the head unit, so that means the head unit is not considered to be either system 1 or system 2.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.