How can serial and parallel pickups have same output?

How can serial and parallel pickups have same output?

I own a sterling HH. The H models have 3 way pickup switch (parallel, serie and filter)and they keep the same output.

I modded my HH to have parallel instead of serie but I have a huge drop on output as expected. So what’s the trick to have the same output? Should I add a resistance, capacitor or something else?

thanks

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