Lately my alternator began charging at 15+ volts. I replaced the alternator, checked all the wiring, checked every ground under the hood and everything seems fine but it still overcharges. Reading 15.2 without a load and 15.8 to 16 with a load but never goes any higher. It may be coincidence but it seems like it started right after I had the intake manifold off doing the plenum plate upgrade. Alternator, a/c, etc. had to come off so not sure if anything could have happened there. Anyone have any ideas? Really hoping it's not the pcm because I need the stock pcm to get me by until I am ready for the 5.9 swap!