Andy, as I said earlier, the voltage regulator was going out and what you are reading is now battery voltage. If you read the voltage from the alternator direct you may see a little higher voltage but not much. Again, this is not an uncommon problem I see when you build 30 alternators a day for all makes of cars. You can take it off and have it checked, and they will confirm regulator failure. The Deorean 150 alternator has a life warr. John Hervey http://www.specialtauto.com/electrical.shtml