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IC.8.4.1 Each vehicle must have two Master Switches:
Primary Master Switch
Cockpit Master Switch IC.8.4.2 Actuating a Master Switch must:
a. Stop the engine
b. Disable any alternator field wire
IC.8.4.3 The Primary Master Switch must meet the following:
a. Disable power to ALL electrical circuits, including the battery, alternator, lights, fuel pump(s), ignition and electrical controls.
b. Be direct acting, not act through a relay or logic.
c. All battery current must flow through this switch
d. Be located on the right side of the vehicle, in proximity to the Main Hoop, at the driver's shoulder height
e. Be easily actuated from outside the vehicle
f. Be of the rotary mechanical type. A removable key may only be removable in the electrically open position
g. Be rigidly mounted to the vehicle and must not be removed during maintenance
h. Mounted so that the rotary axis of the key is near horizontal and across the vehicle
i. The ON position must be in the horizontal position and must be marked accordingly
a. Disable power to the ignition and fuel pump(s) and (ETC only) the electronic throttle in the OFF position
b. May act through a relay
c. Located in easy reach of the belted in driver, alongside the steering wheel, and unobstructed by the steering wheel or any other part of the vehicle
d. Must be a push-pull or push-rotate emergency switch where pushing the button is the OFF position
e. Have a minimum diameter of 24 mm
IC.8.4.5 The international electrical symbol (a red spark on a white edged blue triangle) must be near both Master Switches.