My money says it may be a short to ground, or else heat/tired flasher.
They will burn the contacts within the control arm as well.
Disconnect the harness from the signal switch and test the resistance on wires 22-460 and 22-461. One of those is usually the culprit. You can also check 460 and 461, but they are usually OK.
Wiggle the frame clips slightly against the harness while someone is watching the ohmmeter and you may find the problem.
If you want to try a 24 volt commercial flasher, splice it into the A and B wires instead of the solid state flasher. Leave C wire alone as it is not used on a flasher. Resist the temptation to hook C to the third terminal of a flasher in the case of a 3 prong. C is a ground, and the third terminal is the little light on the arm of the older flashers.
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