I don't have EFI Live yet, but will soon for my truck. But my dad is having problems with his gasser. I was wondering if EFI live can monitor what the ECM is telling the Alternator to do on his '08 6.0L. And if EFI live can change what the ECM tells it to do.

His is dropping voltage after being under a load to 13v where it should be minimum of 13.9v according to their service bulletin. If the alternator signal wire is disconnected from the ECM the voltage jumps up to 13.7v which must be default, so I know the alternator isn't the problem. It is either a faulty ECM or faulty programming. The truck only has 6,000 miles on it, and is used mainly to plow his driveway, which is when he found the problem.

Thanks for the help