Electrical Schematic in provisional patent

[Mark]

In multiple provisional patent examples, including one on this site, I've seen simple electrical schematics included in the drawings.  Is this always necessary, especially if it isn't the novelty of the idea?

Also, do connecting wires need to be shown in included drawings?

[Brad]

Its not required but highly recommended to include a simple block diagram showing the different electrical components in your invention.  Very technical wiring diagrams are not needed.

You need to ask yourself what an engineer would need to see in order to re-create your invention without any guesswork.  That level of detail is needed for a proper patent application.