1967 camaro rs battery draw

[Big Block Bill]

Originally Posted by ALLZS

what can cause the battery to drain down overnight on a 67 rs camaro convertible there are no interior lights left on or other aux lighting

Start by removing the negative battery cable and installing a 12 volt test light between the negative post on the battery and the cable end. With everything off, and the doors closed, If the test light lights up, you have a draw in the battery. Next remove (1) fuse at a time until the light goes out to see which circuit the draw is in. If you pull all the fuses and the test light is still lit, disconnect the positive wire to the alternator. If the test light is still lit, disconnect the positive cable to the starter. If the light is still lit, you have something positive shorting to ground. Bill

[Too Many Projects]

Bill is right on, but if you are still running the original style, externally regulated alternator, I would start there before pulling fuses. My experience with this when these cars were still around is that a diode would short out in the alt and ground out. You can look at the dash in the dark and see if the alt light is faintly glowing too. I've seen that happen with a shorted alternator.
If the alt isn't the issue, then start pulling fuses...