[Michael C Henry]

A simple test is to dissconnect the battery after charging and let it sit overnight and then reconnect to see if the battery held that charge, or has an internal short.
When I bought my car in Remo (August) It had a master switch mounted on the firewall accessoable from under the dash. It was a little awkward (impossible) to get to after belting in. I often negelected to turn off that master switch when running errands, either from forgetting or, expecting to be only a minute. After leaving the car the hot water would collect at the top of the engine and radiator (where the thermo sensors for the electric fans are) and turn on the fans (4). The fans didn't make so much noise that you could hear them from any distance. I'd return to the car after more time than I"d planned on and find the battery drained. If Iwas lucky enough to have enough battery to get the electric fuel pump to click a few times and any incline, I could get the car to roll and dump the clutch and start. Some times It didn't work. I tried a Battery Brain, a automatic battery disconnect switch that mounted to the battery and was supposed to dissconnect the battery automatically. I'd have it turned on to the manuall position or something and it didn't work. Then finally it quit working completely( I was actually sitting in the car in the street, engine turned off, talking to a COP and didn't notice the fans running. My fix was I mounted another master switch from Flaming River on the dash in series with that original master switch and within reach while belted in. Twist the red knob on and just bump it and it turns off.
I do not have MSD I have Mallory. There are two power wires one(switched) and another power on allways on (not switched) for the MEMORY. Different power draws. If your system is similar, make sure that the electrician didn't put them together to make it easy for himself.