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I too had a terrible problem several years ago. It turned out to be a bad ground from the pass side parking light to the radiator support. Now that I am knee deep on this one, I installed 10 ga ground wires from the headlight/parking light cnnectors to the radiator support. And you know what? My surging turn signals are gone!

Check your grounds on the parking lights as well.
Good luck...

Steve Leslie, 65 coupe in restoration. 302, toploader, A/C, disc brakes, bench seat
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