Wiring diagrams enable technicians to

Wiring diagrams are used by technicians in building and servicing a device successfully

Explanation:

wiring diagrams are representation of the components of a circuit in the form of shapes, the power and signal connections between the components of the circuit is also considered and represented in the wiring diagrams. this wiring diagrams shows the position and arrangement of devices components and the terminals on the device in which the circuit diagram is been made.

Technicians can't perform the building and servicing of a device successfully because it is a means of communication between the engineers ( designers ) of devices and the technicians.  

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