I have a Sony MEX-1 head unit and did the installation myself. All is well except one thing, Every time I turn on the car I have to reprogram the clock settings and all my audio tweaking. It doesn't retain a memory, even though it has one. Now my first thought was oh, my acc line is not hot or something...or maybe I didn't wire it right, but after inspection I was looking at it, and all my wires are right. Except for one wire which is the acc line in. Now I used the cigarette litter as the supply for this voltage, but I'm thinking that the cigarette liter doesn't work when car is, which would explain the problem, but any ideas as to a constant output while car is off would be great, maybe lights?? I don't want to fudge anything.