Can't figure out an electrical draw?

So I bought a test light pulled the negative battery cable and started pulling fuses to see what the draw was.
I had figured out last year my stereo was the draw so I bought a new one installed it and the same problem arose?
Any stereo guy's out there ? I went back and checked to see that the red wire was hooked up to the acc power only when the ignition is on for the memory? Right?
Then I have a yellow that is hooked direct to the positive battery cable with a fuse right before the battery.
If the yellow wire is hooked up there is a draw when the car is shut off.
I tried pulling just the acc or just the yellow wire but the stereo won't work if they are not both hooked up.
Any thoughts would be great , I'm getting tied of pulling the negative battery terminal every time I drive the car every weekend.