FIG. 2 A, B & C is a flow chart of the switch; FIG. 3 is a circuit diagram of the device; FIG. 4 is a block diagram of the circuit of FIG. 3 showing the inputs and outputs of the microprocessor; FIG. 5 is a diagram of a version with one switch acting between the like poles of the battery using isolated voltage detection; FIG. 6 is a perspective of the battery, starter motor and ignition switch for