Abstract: An improved discretionary current input circuit includes a switch sensing an operating condition of a tractor and having a first state if the operating condition is not satisfied and a second state if the operating condition is satisfied, and a microcontroller that deactivates at least one function of the tractor if the switch is in the first state. The switch draws a nominal current except during specified time intervals that are shorter than the time for drawing the nominal current. A power transistor is connected through a diode and resistor to the switch. The power transistor normally is in an off condition, and is powered during the specified time intervals to an on condition to increase current above the nominal current to a threshold through the switch.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed to monitor engine starting systems. An example apparatus includes processor circuitry to execute instructions to measure engine starting system data from a machine; determine a total starting crank time and an ambient air temperature for the machine from the engine starting system data; compare the engine starting system data using a machine learning model; model a relationship between the ambient air temperature and the total starting crank time; generate a score of an engine starting system from the machine learning model; determine comparison result from the relationship between the ambient air temperature and the total starting crank time; and display an alert to a user based on at least one of the score of the engine starting system or the comparison result from the relationship between the ambient air temperature and the total starting crank time.

Abstract: An improved discretionary current input circuit includes a switch sensing an operating condition of a tractor and having a first state if the operating condition is not satisfied and a second state if the operating condition is satisfied, and a microcontroller that deactivates at least one function of the tractor if the switch is in the first state. The switch draws a nominal current except during specified time intervals that are shorter than the time for drawing the nominal current. A power transistor is connected through a diode and resistor to the switch. The power transistor normally is in an off condition, and is powered during the specified time intervals to an on condition to increase current above the nominal current to a threshold through the switch.