In a positive switching ignition system, which position(s) will an Ignition #2 circuit show 12 volts?

In a positive switching ignition system, the Ignition #2 circuit is designed to be powered when the ignition switch is in the RUN position. This is because the RUN position allows the vehicle's electrical components to receive power while the engine is operational, ensuring that systems such as the fuel injection and other necessary electronics function correctly.

When the ignition switch is in the START position, the battery power is typically directed to other circuits needed to crank the engine, and the function of the Ignition #2 circuit is generally not active during this momentary time. The ACC position, on the other hand, is usually intended for powering accessories when the vehicle is off, and it does not engage the Ignition #2 circuit for engine operation or other main electrical functions.

By understanding the role of these different switch positions, it becomes clear that the Ignition #2 circuit will consistently show 12 volts only when the ignition switch is in the RUN position, as this enables the necessary electrical systems for running the vehicle.