When wired correctly, a humbucker has reversed magnets and reversed wiring to cancel hum while keeping your sound. If you wire both the coils in-phase with the reversed magnets, as someone has done here, you cancel the guitar sound and double the hum. The result is a weak, thin sounding guitar you can barely hear over the 50/60 cycle hum.
Wire colors don't always mean the same things when looking at different pickup brands.
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