An alternator overvoltage protection circuit comprising: a conditioner section, a trigger section, a drive section, and a disable section; said conditioner section is connectable to an alternator rotated by an engine, and said disable section is connectable to a load; said trigger section is located between and electrically connected to said conditioner section and said drive section; said drive section is located between and electrically connected to said trigger section and said disable section; said load is a coil of an engine component, wherein removal of power from said coil is configured to disable said engine; said alternator is configured to provide power to said coil through a disable resistive element of said disable section, wherein a second end of said disable resistive element is connected to a first end of said coil; said conditioner section is configured to condition voltage output received from said alternator, and output said conditioned voltage to said trigger section; said trigger section is configured to receive said conditioned voltage from said conditioner section; said trigger section is further configured to output current to said drive section when said alternator output voltage exceeds an alternator overvoltage threshold, wherein said trigger section does not output current to said drive section when said alternator output voltage does not exceed said alternator overvoltage threshold; said drive section is configured to activate said disable section when said drive section receives current from said trigger section; and said disable section is configured to divert at least a portion of current away from said coil to a ground of said alternator overvoltage protection circuit through a low impedance path when said disable section is activated, thereby disabling said engine, wherein said disable resistive element is comprised of a resistor having a resistance value such that said coil drops out, due to the flow of current through said low impedance path, when said disable section is activated, wherein the dropping out of said coil disables said engine. a conditioner section, a trigger section, a drive section, and a disable section; said conditioner section is connectable to an alternator rotated by an engine, and said disable section is connectable to a load; said trigger section is located between and electrically connected to said conditioner section and said drive section; said drive section is located between and electrically connected to said trigger section and said disable section; said load is a coil of an engine component, wherein removal of power from said coil is configured to disable said engine; said alternator is configured to provide power to said coil through a disable resistive element of said disable section, wherein a second end of said disable resistive element is connected to a first end of said coil; said conditioner section is configured to condition voltage output received from said alternator, and output said conditioned voltage to said trigger section; said trigger section is configured to receive said conditioned voltage from said conditioner section; said trigger section is further configured to output current to said drive section when said alternator output voltage exceeds an alternator overvoltage threshold, wherein said trigger section does not output current to said drive section when said alternator output voltage does not exceed said alternator overvoltage threshold; said drive section is configured to activate said disable section when said drive section receives current from said trigger section; and said disable section is configured to divert at least a portion of current away from said coil to a ground of said alternator overvoltage protection circuit through a low impedance path when said disable section is activated, thereby disabling said engine, wherein said disable resistive element is comprised of a resistor having a resistance value such that said coil drops out, due to the flow of current through said low impedance path, when said disable section is activated, wherein the dropping out of said coil disables said engine.