Some aftermarket electronic flashers are polarity sensitive. The wiring going to the flasher socket *should* be correct based on the standard but sometime the wires are reversed from the factory, and with a mechanical flasher that flashes based on load, it will still work as intended. I found this to be the case while wiring my car.
This may not be your problem but thought I would throw it out there for consideration.
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Michael

1970 Oshawa built 1 option Judge. 24 year restoration/upgrade project finally finished!
1979 Trans Am - low-buck drag car project for when I retire
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