Knight Rider Circuit Help
Hello, I was hoping that someone with more experience could lend me a hand with some tips/instructions.
Here is what I would like a circuit to do:
I would like to mount one or two LED bars behind my grill on my black sedan. I want to make a circuit that will power on the LED bar(s) only when the car is off and only for about ten minutes after the car has been off too.
So when the car is on and running, the lights are off.
When the car is turned off, the LED bar(s) will turn on and provide 12 volts to flash the Knight Rider LED bar for ten minutes, then turn off (preventing the car's battery from dying). I don't want the LEDs running all night so I heard there is a "relay" or 555 monostable chip, or something similar like that which can allow the LED bar to stay active for only the ten minutes after I turn off the car. I can connect the 12 volts directly to the battery since it's right next to the grill, but I don't know where to connect the power that is on when the car is on. I know the yellow ACC wire from behind the stereo is always on when the car is on, and off when the car is off, but it would be difficult to get to since it would need to be ran into the car through the firewall. Though this might be the easiest way.
Also, I would like the LEDs to turn off again if I start the car (even if I start the car within the ten minutes after turning it off). I don't want to be pulled over for flashing red lights, ha.
Please give any help or outlines if possible. Please use detail in a reply as I am not an electronics major. I will use my local RadioShack for parts and will obtain the Knight Rider bar from an internet website.
If you could use MSPaint or an Image Program and maybe draw up a schematic, I would greatly apriciate that.