Vortex4 explained :
Park one wheel on a metal plate and some kind of ceiling contact. Ground the
plate as well.

I've got no idea how many ohms a tyre would present in circuit...but surely a
small enough figure to trickle charge a battery?

Several megs at least, so no.

--
Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk