One common cause of very low resistance would be the coil or a stray leg touching something, but that would show up on any mod not just the BB. Sounds like a short in the positive pin might be the problem like you said. If you have a meter maybe you could test the pin. I can't remember what it looks like. Could a bit of wire have dropped into the top end of the pin?
I’ll take a look at it. Thanks for the advice.
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