jumper cable

noun3

1. •
   A pair of insulated electrical wires with alligator clips at each end (typically used to jump-start a car with a dead (flat) battery).

   • He kept a jumper cable in an emergency box in the car, as he had once been caught with a dead battery.
2. •
   An electrical cable providing a connection between rail or road vehicles.

   • When in multiple the control between the locomotives is through jumper cables, and air and vacuum hoses. — 1958
3. •
   (Philippines) A jump wire.