Electric starting motor control system

An electric starting system for cranking an engine comprising, an electric starter comprising an electric cranking motor and a solenoid having pull-in and hold-in coils and a shiftable plunger, said cranking motor having first and second terminals, a pinion driven by said motor that is shifted by movement of said plunger that is adapted to mesh with the ring gear of an engine, switch means having first and second contacts that are at times electrically connected by a contactor that is shiftable by movement of said plunger, a manually operable start switch, at least one N-channel enhancement mode field effect transistor having a drain, a source and a gate, a source of direct voltage having positive and negative terminals, means connecting the positive terminal of said voltage source to said first terminal of said cranking motor, means connecting said pull-in coil between the said second terminal of said cranking motor and the drain of said transistor, means connecting said source of said transistor to said negative terminal of said voltage source, means connecting said hold-in coil between the positive terminal of said voltage source and the drain of said transistor, means connecting one of the contacts of said switch means to said second terminal of said cranking motor, means connecting the other contact of said switch means to said negative terminal of said voltage source and means connecting said start switch between said positive terminal of said voltage source and the gate of said transistor whereby when said start switch is closed said transistor is biased conductive between its drain and source, said transistor when conductive causing said pull-in and hold-in coils to be energized to thereby cause said movable conductor to be shifted into engagement with said fixed contacts.