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Only problem I could see would be the same one that I had when I put my grille lights wired off of the high beams. It only happens if you have DRLs and it's caused by the low voltage of the DRL making the relay 'chatter' but if you don't have DRLs, then you'll be fine. There is no flash required if you are using a relay system triggered off of the highs but having power fed from the battery as it wn't affect the power going to the lights themselves.
