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.
Schematic diagrams are printed way too small in the manuals. Take your drawings to a copier that enlarges and blow them up to easily-readable size. Tape all the sheets together into one big drawing an you will find that tracing electrical paths becomes very straightforward.
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