Review on 🚦 EP27 Flasher Relay: Perfect Fit for Ford F150, F250-F450 Super Duty Trucks (97-12), (99-10) - Fix Hyper Flash, Compatible with LED and Stock Bulbs, Electronic Turn Signal and Hazard Warning by Joseph Neal

If you have F150 2009 and up, unfortunately this is not a solution for fast flashing as regular light bulbs are replaced with LEDs. There are no serviceable turn signals in the car - the speed is controlled by the BCM. Even the clicking sound is imitated. The only solution is to use resistors at the end of the bulb to provide enough load for the BCM to assume a bulb is installed. This has a small downside: if your LED lightbulb fails (which is very unlikely), you won't know about it because the resistance still gives the impression that the lightbulb is working. Revain sells adapters that plug into existing terminated outlets. I'll try that I think. I am disappointed that this product did not work in my truck.