In a positive switching, high current ignition system, which ignition switch circuit has +12V in the ACC and RUN positions but not during START?

In a positive switching, high current ignition system, the ignition switch circuit that has +12V in the ACC and RUN positions, but not during START, is typically designated as Ignition #2. This configuration is important for various components and systems that need power when the vehicle is in ACC or RUN but should not receive power during the START position to prevent potential damage or unnecessary power drain.

In this setup, the circuit allows components like accessories or specific electronic modules to operate while the engine is off (in the ACC position) or when the engine is running (in the RUN position). However, when the vehicle is in the START position, this circuit is intentionally cut off to prioritize the battery's resources and assist in cranking the engine without side loads from other components.

This distinction is crucial for the proper functioning of the vehicle's electrical system and ensures that starting conditions provide maximum power to the starter motor while limiting power to other circuits. Understanding this aspect of ignition system design is key for any technician or professional in the mobile electronics field.