Bad connections can happen for a variety of reasons. As wires carry electricity they get hot, so it is possible after a lot of use for a connection to melt and no longer make contact. If the connect is outside of the cabin of the car it could get rusty or dirty to the point where electricity will no longer flow. It is also possible that from use and vibrations the wires simply disconnect. In this case you need a wiring diagram for your vehicle, a circuit tester and a lot of patience.
The pins and sockets are responsible for conducting electricity from one half of the connector to the other. These are made very precisely so that the pins and sockets fit together with just enough force to ensure a good connection, but not enough force to make connecting and disconnecting too difficult.
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