In theory you should be able to measure duty cycle by reading the voltage at pins 2 and 3 of the X11 connector. In other words, with the key on engine off you should get 4.0 V. Divide 4.0/13.6V = 0.294, subtract 0.294 from 1 = 0.706 or 71%. Simple math right? Well, Ive been getting wierd DC readings on my tester lately so I decided to check this static method out. I get 0.04 V KOEO between pins 2 and 3. I tried 5 different meters and got the same thing. What can affect the static DC reading this way or have I just lost it?