Direction indicators are usually very reliable, though all the wires come together at the hazard light switch, consequently many indicator problems can be caused by a faulty hazard switch - little used hazards are often a problem especially when the occupants are smokers though operating the switch rapidly for a minute or two usually restores operation.
Other than the wiring to the hazards, the indicator circuit is relatively simple but there is little point declaring the switch and the fuse is ok - unless you have checked these things with a meter or testlamp.
In spite of the circuit being simple, things like multiway connections, terminal crimps and lots of wire provide lots of chances for faults to develop and only chasing the power through the circuit with a means of checking has a chance of finding most problems...
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