Need help finding an electrical drain

[dan1520]

My gosh it never ends!

On my 57 T-Bird, I noticed the battery was draining from full charge to nothing in a few weeks. I thought it was the battery but when I disconnected the negative cable from the motor ground, I noticed sparks as I unscrewed the bolt. That tells me that there may be a current drain somewhere that's draining the battery. I disconnected the cable for a few days and sure enough, the battery has not lost power.

My question is how can I find the drain? I have a digital multimeter if needed. Any tricks to finding the problem?