I upgraded all my lights to LED and this was over a year ago and I have never had any problems. Last night put on left turn signal and it was flashing super fast. The right turn signal still like it should be. I know you guys have talked about adding something in to make it flash slower but why all of the sudden it start this? I am stumpped

 

Maybe an LED bulb has burned out. Did you check the front and the back bulbs?

 

That's what I thought at first. There are like say 20 leds in fron turn signal then about 50 in the rear What do I need to install to get that one to slow down

 

See if one of the outside lights blinks faster...that will be the one that needs to be replaced...

 

I has to be something with the bulbs not the truck since it's been working fine. However some vehicles require the addition of resistors in line with the LED's to mimic the resistance of a filament bulb. Companies also now have LED flasher modules to replace the standard flasher relay.

 

Try swapping the rear bulbs from left to right and see if the other side blinks fast. If that doesn't do it try swapping the front bulbs and that should narrow it down for you.

 

This is you answer, the system thinks a bulb is burnt out and flashes rapidly to warn you.

 

I had the exact same thing happen. Took it to my dealer. In my case it was a blown fuse caused by one of the 3rd party LEDs shorting.

Not sure if this applies to your situation, but it's a simple check and I now know where to start.

Regards,
StanTheMan