Crown Vic Turn Signal Going Crazy? Try this First!

These cars use 2 bulbs in each taillight, which light up at the same time; if one is out, it will cause this issue. Replace all the bulbs at the same time with new bulbs! Don't jump to purchasing a new turn signal switch or another component! This issue is likely caused by a bad bulb!
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[@livid_spider]

My challenger was doing this, changed all the bulbs but it would still do it. Turned out he previous owner put a sequential tail light kit on the car and did a botched job causing some of the wires to come loose on the boards and make contact with the body of the car causing a short. I had to cut the sequential tail light kit out and basically take the car back to stock, hasn’t had an issue since

[@rodneyadamson8270]

I used to own 78 Ranchero did the same thing.. ground from block to firewall loose 😂😂lol

[@houseofno]

A word of caution: be sure to use the appropriate bulbs, and I will explain what I mean by that. In older, pre-computerized cars that don't have the bulb out function indicators, nearly any bulb will work as long as its the correct voltage supported by your electrical system. But on the newer computerized cars, bulbs that have a different color base or different metal will have an entirely different resistance value, which means that the computer will indicate a bulb out condition even though the bulb is working fine. The computer will see a different resistance value than what it thinks its supposed to see and give you this issue.