Electrics & Electronics: Electrical Principles: Wires & connectors procedures
Stripping wire insulation
 
When electrical wire is joined to other wires or connected to a terminal, the insulation needs to be removed.
 
Installing a solderless terminal
 
Solderless terminals require a clean, tight connection. So make sure the wire and the connection are clean before fitting any terminals.
 
Soldering wires & connectors Flux is needed to prevent the metals being joined from oxidizing when they are heated.