jet if its the same one Im thinking of he puts the mulitmeter on the caps. One of them fills fast to 16 v and the other one was a little slower but still @ 16 v. This is the monopole that has a large coil either side of a vertically rotating acrylic rotor. There is an aluminum timing wheel off to the side which dumps the charge every second or so into the batteries. I believe it is the one triggered by a hall switch?