With an uneven rhythm of flashing on different sides, it should be assumed that on «rapid» board, one of the lamps is defective or a wire is broken.
The cause of other faults lies in the breaker relay. Remove the relay to check. Using auxiliary wires, connect the relay contacts and 2 with the battery, connect two incandescent lamps connected in parallel for direction indicators to contacts 1 and 2. The lamps should flash at a frequency of 60 to 120 times per minute. Replace the breaker if this condition is not met.
If a new relay is not available, a thin wire can be inserted between pins 2 and 3 in the relay connector. Bend the ends of the wire before inserting. Reinsert the defective relay.
Turn on the ignition. When switching the turn signal switch, the turn signal lights are now permanently on. By quickly turning the switch on and off, you can simulate the operation of an interrupter. But this is a temporary replacement.
If the direction indicators do not light up and with a jumper, then the cause of the malfunction should be sought in the switch or in the wiring.