you will need to change the flasher relay to get the right flash on these LED bulbs, The flasher relay uses the bulbs' current to trigger each flashes, and the LED bulbs draw sooooo much less current compare to the regular bulb. LED are like 0.4 amp vs. 2 amp. you can go ebay and find a LED flasher for like $5 shipped from china ( downside is it'll take a week or 10 days to arrive.)