I wouldn't think the mag would have anything to do with a battery drain since a mag isn't powered by the battery. Instead I would probably go for the voltage regulator. Connect a test light in series between a battery cable and the battery post. If the test light lights up, then you have a drain. If not, then you probably have a battery with an internal drain. If you have a lit test light, then start disconnecting wires, one at a time. When you disconnect the circuit with the drain the light will go out. I would probably start with the wires to the VR. The VR contacts can stick, causing a drain. Hope this helps.
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