I have a 1970 SS396 that is completely stock/original. I just purchased the car and we had to charge the battery when I picked it up. After about 2 days, that battery was dead. Since the battery was 6 years old, I put a new battery in the car and it lasted for about 5 days and was dead. I did drive the car about 100 miles on Sunday and when I got home it wouldn't start until I charged the battery; so I believe it is being drained down while the engine is running. I pulled the alternator off last night and it appears to be the original one dated March, 13, 1970. I believe is was a 37 amp (It was thirty something). Does this sound like the alternator or voltage regulator problem? I have ready many of the posts here about the internal regulated alternators. I do not want to alter the wiring at all on my car, but I am interested in upgrading the alternator if possible to do so without wiring modifications. I have a local shop that can rebuild the alternator for me if necessary. Thanks.