Freak of Nature
Here's the issue with my 1996 F250 7.3. Truck has a brand new alternator from what I can tell the alternator is working fine. 14V off the main wire, then I have 14V at the plug except the middle wire which is 7V. The problem is the gauge in the dash is reading low and dims when the headlights are turned on. I have the ford hi idle box which tells me the voltage and it will jump back and forth from 11V to 13.8V. it used to always read a steady 14.2V.