One of the safety features in the diagram above is the presence of two contactors in the circuit. Before this ciruit is closed both contactors have to be closed. And for that to happen a specific sequence of events is required. This sequence of events starts with the ignition switch.
Just like in the original vehicle the ignition switch serves the same general functions. The two functions of interest I'll talk about are RUN and START.
RUN is the position the ignition is in after you start your vehicle and it is running normally. START is the position you put the ignition to get the engine cranking.
In order for electricity to get to the motor two contactorshave to be closed. The first contactor is closed when the ignition switch is put into the run position.
The second contactor is controlled by the "Hairball". The Hairball is part of the Zilla controller. One of its main purposes is to interface with other components of the electrical system.
Hairball connection 4 is connected to the start position of the ignition switch. In the original car this ignition position energized the starter motor in order to crank the internal combustion engine and get self sustaining combustion of the engine started. In the electric vehicle this ignition position signals the Hairball to "turn on" the controller and close the second contactor.
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