I went to start my '68 Gt yesterday and found that the battery was dead. I hooked up the charger and after 30mins tried it again. It worked, the car started. I checked the battery voltage and found a steady discharge. Over a period of 3-4 mins it went slowly from 13.5 to 12.5 I did a quick test of the alternator by disconnecting the connection to the +post. The engine immediately started to die. Obviously no power from the charging system, the car was running off the battery. I held a small screwdriver to the plug in the center of the back of the alternator, it was magnetized. So, now to my question: what's wrong, the alternator or the VR? If I remember correctly the VR is an old style points type. If it's the VR that's bad I'll change it for a new electronic type. Which leads to another question: what electronic VR interchanges with a '68?