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What you describe is a pretty good sign of a bad earth, or a sheilding problem.
Unlikely to be the cap, might be pots, although these last well. Hit them with some electrical contact cleaner, they could probably use it anyway after 20 years.
You can test the value of the vol pot with a multimeter. Its normal to use 500k with a HB pup, so if one is 500k, the other probably is too. The cap value should be .022, maybe .015.
Even HBs will produce a little hum and earth buzz. If its too much, and youre happy that the wiring is correct to the diagram youre using, youve got a dud/dry solder join somewhere, or a badly shielded piece of wiring.
Is the pup mounted to a guard, strat style, or mounted to the body, Gibson style?
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Stuart
War crimes will be prosecuted. War criminals will be punished. And it will be no defense to say, 'I was just following orders.' George W. Bush
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