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Ok, overnight I looked a little more, and I didn't realize that the batteries were originally connected together. Knowing that, now it makes a lot more sense. I was ultimately planning to get an isolation transformer, but I semi-frequently run across 'em for free if I look for 'em, so I was just gonna run the whole deal off a separate line conditioner box until I could find one.
But for any of this to work, I still need to know the current draw from the HV lines so I can get the resistor values right... I found some generic info for making battery eliminators for later farm radios, but there is some bad math in those, and I'm still left back at square one.
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