I have a 1977 280z that I'm working on and the biggest issue I have at the moment is that the battery drains, even when the car is off and the keys are out of the ignition. Specifically, at least based off of the stock volt. meter, the battery drains in pulsing manner (see linked video).
http://www.youtube.com/watch?v=sX17VoZ2 ... e=youtu.be
I haven't the slightest clue as to where I should start checking for a cause, other than just picking a point to start and checking out every circuit in the car, which is why I came here. Are there any common causes for the battery to drain or possibilities based off of how the power is being drained? The stock fuel injection has been replaced with carbs, so that can't be a cause.
Any help is greatly appreciated.