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The way electricity is made is fundamentally by pushing electrons out of orbit continously. The magnetic field sitting still displaces them but it just creates a minor voltage difference. If you move it you can make a flow.
You have to move the magnet in the direction with the right hand rule. Curl your fingers around the palm around the coil with your fingers pointing into the middle with the direction of the magnet. The current will flow in the direction of your thumb.
That said. . .the super easy effective way would be to put tons of copper coil windings around the actual spring and just mount a large magnet on either end(top or bottom, make sure you don't make it long enough to strike the other side under heavy load).
The up and down motion that the springs absorb would induce the current.
Its kind of simple. . .copper wire around springs(lots) and a really powerful magnet. Neodynium(sp I'm sure). Test it on one of your springs with magnet and then put a DMM and push down on that tire(jump on the chassis there if it will take it) and watch the output reading. . .
For a normal car I'd expect a max of 60 watts per tire. . .Although if your zorber is totally shot like a 86 stock buick town tank you could get a whole KW!
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