Hey y'all.
I replaced all my exterior bulbs except headlights with LEDs. Now my turn signals flash a bit faster than with incandescents. I read somewhere that turn signals can only flash a set number of times per minute. I think they're ok but don't know for certain. I also read it can be fixed with a relay for LEDs. Can someone that truly knows tell me if there is a flash's per minute law? And does my truck have a flasher relay? If so where? And if someone knows what relay I need that would be nice too. If not I guess we'll see what happens over time and at the next inspection.
Thanks and Happy Motoring.

 

You need 1 resistor for each led bulb used to stop hyper flash. I used these type on my truck.

 

No. It's not a "law" but there likely is a regulation that defines what the flash rate should be for a properly operating system.

Nope. It's a software function located within the Smart Junction Box. The hyper-flashing is due to the reduced current drawn by the LEDs so the software assumes that a bulb is out. Bulb out detection can be disabled on certain trucks with Forscan, I don't know if that function has been identified and documented for the '10 F150. Check the various Forscan spreadsheet threads.