Amp wiring help

Hey guys, i need a little help for installing my amp.

My radio doesnt have a remote output to go to the amp. Ive been told i can take it from any acc. line. Is this correct? And if so, where can i find an acc. line from the trunk? I already ran the power cable from the battery, and found a good ground in the truck, all i need now is this acc. line to the REM (remote)

Thanks for the help!

you can connect the remote wire to the ignition wire that you used for your cd player. it will work too. all you need is a wire that turns power off when you turn off the key.