• Get a switch, some wire and a soft iron core.wind around the iron core a coil of wire. One end of the wire go to the battery negative connection. The other wire goes thru the switch, that is you cut the wire and attach them to the switch. The output wire goes to the positve side of the battery. Wish i could draw you a diagram.+ side of the battery------/Switch----core----_ batery Good luck Bob m.

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