Quote:
Originally Posted by kgb
How would wiring a switch in make any difference, I am not following? It's convenient but connecting and disconnecting the brown wires achieves the same end.
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Simply for the purpose of a scientific test should you want to carry one out. The switch can just be wired as a temporary setup and held by the passenger. That way the switch state can be changed under various conditions without the knowledge of the driver to rule out any perceived effect.