where else can i hook up amp turn on to besides my power line? just need an idea

 

You can simply run it to your fuse panel inside the car ...just find an ignition controlled slot or accessory slot. If you do it like that then the amp will be on if the car is running or in the accessory position. If you want the amp on only when the deck is on then you will need to hook the amp remote to the deck's remote turn-on lead.