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I had a bad short in a B+ line in my 71' Zenith reciently, and I tracked it down by unhooking the different branches of the rail, and checking the individual resistances to ground and then going after the one with the lowest resistance till I found the exact spot that was shorted. Since you can still run it you can probably find fault by disconnecting everything from the overloaded rail, and slowly reconnecting things untill the supply voltage drops drastically.
Just a thought.
Tom C.
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