Any way to determine polarity on pickup coil?

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You are talking about an electric guitar, right? Mostly this is done by temporarily connecting in parallel and playing a few notes, then reverse one of the coils to see what sounds better. It will be rather obvious which is in phase and which is wrong.
 
If it is just an inductor without a magnet or additional electronics then it shouldn't matter. Coil of wire in and of itself has no polarity.
 
The crank has a metal piece that swings by the pickup. The pickups have 2 wires that come out of them., if that helps.
 
Originally Posted by sloinker
If it is just an inductor without a magnet or additional electronics then it shouldn't matter. Coil of wire in and of itself has no polarity.


A sine wave across a load resistance is the resulting output.

Conditioning electronics in the ECM or PCM use what is called a "schmitt trigger" device to square the waveform to convert it into a pulse.

https://howtomechatronics.com/how-it-works/electrical-engineering/schmitt-trigger/

Now the electronics may want a rising edge or a falling edge of the wave form, so try it in one orientation and if the electronics don't like it, reverse it.
 
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