I hooked up my fully charged, practically new, battery and it was completely dead 8 hours later. Yesterday I ordered a new Voltage Regulator and related pigtail connector since the one that’s there looks really nasty. I would have purchased a new alternator harness, but apparently that’s not available for 73, so I just replaced the 2 spade connectors and cleaned the other connection. Since I still see a spark when I go to connect the positive battery cable to the battery, I assume the problem is still there. How do I use a Multimeter to locate the source of the power drain? Should I be measuring DC Volts, µAmps, mAmp, or Amps? Open circuit or closed circuit? Is there an easy process of elimination I should follow by removing fuses?