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Tony:
MSD boxes get blamed for many things that ultimately turn out to be something else. The energizing of the box through the swiched 12 volt souce with the small Red wire is what turns the box "ON". 1. Disconnect this wire and see if the problem persists. 2. Next check for current drain at your fuse panel. 3. Lastly have the battery checked for a bad cell, even if it is a relatively fresh battery. 4. If all of the above check out look to the ignition switch. MSD units can and do stay attached to the battery and ground with the 10 Gauge wires for weeks at a time without any significant drainage on the battery.
Good luck
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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