Are your bulbs incandescent or LEDs?
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This is the first sentence of post # 24, "You could STILL have a problem of not enough load if the turn bulbs being used are the wrong wattage. Can you look at the wattage of each of the 1157 bulbs and report back? It should be 27-28 watts for the turn element and 8.3 watts for the park element. Basically it takes 50 watts or more per side to allow an OEM flasher to flash. "Continue to be stumped. I have 10w single element in the rear and front turns have dual filament 23/8w. The bright bulb illuminates on turn, just doesn't flash. I can hear the flasher click on once during the initial illumination, just doesn't click back to flash.