Wish to have DVD system on when key out

jump a wire from the fuse box where it says lighter,to a constant power ,ex:horn,acesory lights,headlights,etc. if you use a test light you will see which fuses have power when theres no key.or you could run a direct line from the battery to the cigg lighter ,must put inline fuse if u do that. be carefull not to use a small fuse.it wiill pop. simply pull the chip fuse out and place the wire in the hole.thats one way<not proffesional> but effective and pretty safe...or get some other ideas from evryone else?

Thanks dannydoo I will try it . Al

Use a fuse tap. BTW, your car turns off accessories while the engine is off/cranking for a reason. I wouldn't fool around with it.