Guitar pickup generator/dynamo

Hi

I'm trying to play with some small dc generators and im getting good at it
and i am allso playing guitar and i recently changed my Pickups and since i think i've got the basics of generators.
and i thought that maybe i could use the old ones for generators because they are basicly just copper coils with some magnets glued onto them, but i tried to connect a battery to an LED going thru the pickups but i dont get a signal

WHYYYYY!!!???!!!???

Because the output of a pickup is very small, and the impedance of the coils is fairly high.

so i cant use them for generators

They don't generate enough power to be useful for much of anything other than to feed into an amplifier to make sound.

But if the goal is to make LED(s) light up when you play the guitar, you could use a battery-powered op-amp circuit to amplify the signal to drive the LEDs.