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Did you remove the ground wire bolts between the radiator and the fender on both sides and clean all of that real well? If you switches are all good, your dimmer is good, your lights themselves are good and your grounds are good. Then the firewall plug or a rubbed raw wire is your issue...

That means your high beam switch is probably the problem.

Check the connectors on the back of your black out light switches and then move onto the master head light switch if you have checked everything else. One question, is it just the head lights flashing or all the lights?