Good question JD, it was fun meeting you at Half Century. FWIW here's the theory involved even if it doesn't answer your question.
The flow of current in a conductor causes the creation of a magnetic field and the greater the current and/or the closer to the wire the stronger the field.
If its alternating current, the magnetic field thus generated is constantly changing its North South magnetic polarity
A changing magnetic field can generate electricity into a nearby coil of wire, that's how a generator works, the armature (a coil of wire) is rotating through a changing electromagnetic field created by the passing of current through the field windings.
If a coil of wire was in proximity to that changing magnetic field a voltage will be induced across the coil
NOWWWWWWWWWW if perhaps an ignition coil or a generator (like in a tractor) or Voltage Regulator relay windings were in that magnetic field and the coil ends where the voltage got induced had a closed circuit enabling current flow, there could "somehow" be a conductive path drawing current causing the battery to discharge BUT IM NOTTTTTTTTTT SAYING ITS POSSIBLE OR IMPOSSIBLE OR HOW OR WHY IF AT ALL IT MIGHT DISCHARGE A BATTERY IE I'm NOT answering your question, but ONLY tossing out some magnetic field theory DO WITH IT AS YOU PLEASE LOL
Its hard to believe how such a weakkkkkkkkkkk magnetic field so farrrrrrrrrrrrrrrrrrr away from any tractor coils of wire (ignition coil or generator or coils inside the voltage regulator) could somehow discharge the battery BUT AFTER NEARLY 20 YEARS ON HERE I LEARNED NEVER SAY NEVER AND NEVER SAY ALWAYS as someone who loves to play GOTCHA will jump out of the woodwork LOL
Best wishes yall, sorry I cant answer the question, I do try my best when I can
John T Toooooo Longggggggggg retired Electrical Engineer and weak on magnetic field theory
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