Anyone run a 16V battery and Alternator? I upgraded to a 16V battery and charging system over the winter and now I am having issues trying to write to the ECU. I was able to read from the ECU then write but it decided to stop writing all together. I can read from the ECU just fine. I have tried 2 0411 ECU's, 2 different Laptops, Old Tune files, Updated to 4.6 and even tried 4.7 beta. Im trying to figure out whats wrong and only thing I can think of is the change in voltage. This setup has worked for the past 2 years.
Key On Engine Off I get 16.72 Volts
Thanks in advance.
Greg