Toby, I'll insert my comments to your post. To begin with, I have a Delco 108 amp alternator installed (for the past 8 years or so). At present, my "idiot light" is glowing most of the time, ( This indicates normally a short to ground, either through the regulator or diodes. ) and the voltage in the system is showing 14.5 volts using a digital multimeter at the battery terminal in the engine bay. ( This is the correct place to measure the voltage and 14.4 up to 14.7 is a typical regulator voltage. You can get higher. It will vary with manufactures and application.) The static voltage in the car is about 13.2 volts with the engine off. ( With the car off the OCV voltage should be 12.66 , Do this test. Turn on the head lights for about one minuet and then wait for about 5 minuets and test the OCV again and see if the battery is about 12.66 volts.)( OCV is Open circuit voltage) If I idle the engine, and turn on everything, I see a voltage pull down to about 13.2 volts. Is this an internal regulator challenge with the alternator, or some bizarre ground situation? (With everything turned on and the alternator /regulator is at 13.2 volts,This is good. ) What RPM are you idling. Was the alternator hot or cold when the test was done. I know that the voltages are high ... hmmmmm. (Your voltages aren't high at all.) There is evidence of outgassing from the battery. ( This is normal at times) John Hervey http://www.specialtauto.com/alternators.shtml