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Classic amplification ric wiring help

Three wires almost always means a separate ground wire for shielding. The bare is for shielding, and is connected to the pickup chassis. The two colored wires are the ones connected to the coil. Having a separate shield ground wire allows other wiring options, such as series or phase reversal, without impacting the shielding.
 
That doesn't look like a pickup chassis wire imo looks like a standard ground
 

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If you have a multimeter you can check for continuity between each of the wires and the chassis.

Also, there's this: [Invalid or Expired Link Removed]
 

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