Most owners will run into a situation where they need to repair a broken wire or faulty circuit, or want to add a completely new one, for a pantry light, a backup camera or perhaps a charging port. Being able to make electrical connections in a safe and secure way is critical. If you understand the fundamentals, it is easy to select the correct tools and supplies to do the job the right way.
This is a fine reference for low voltage automotive wiring ..... It is NOT AT ALL appropriate for 120 volt ac residential type wiring. I selected Reader View on my iPad, which neatens up the formatting and removes ads, then saved it as a pdf.
http://www.musclecardiy.com/automotive-wiring/fundamentals-of-automotive-electrical-connections-and-connectors/
This applies to homebuilt aircraft, but it does provide some good insight into what works and what doesn't
I hope this proves useful.
John Davies
Spokane WA