I was talking about this mod with him and he said, lets try it. He killed his truck and we unplugged it. He cranked it up and it was around 14, his digital meter was reading 13.7 and then after about 3 or 4 minutes, it dropped to 12.6 and it stayed there for a while. There was basically no change when he revved up. It did return to 13.7 but it would still fluctuate at idle. I haven't had the chance to speak with him to see how it is now or if he plugged it back in, but I will update once I speak with him.