Start at the 1980 wiring diagram in the information section. It is a bit dense to look at but it is laid out like a truck viewed from above, showing the wires only - dead simple really
Get a highlighter, find your blinkers on there, and get to back-tracin' toward power and ground.
Then, go verify and inspect those connections. If you've got a meter, test for power at the switch, at the relay, at the fuse box, etc.
Or, bring your little yellow wiring treasure map to someone who does this sort of thing for a living and ask them to do the same. You will find your issue.
In my experience it tends to be the blinker mechanism itself. It's primitively designed from a mechanical and electrical standpoint.
_________________ 75 Mikado G180/4sp Desert Tortoise
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