Rear Turn Signal Issue

[Western96]

My rear right turn signal is having a very strange issue.  After I turn it on, it blinks normally for around 2 seconds, and then starts blinking fast like there's a bulb out.

 

All my turn signal bulbs are working.  I do have aftermarket tail lights and a tailgate bar on the back of the truck, but I haven't had any problems with them for months.

 

Anyone else had something like this happen?

[rah7777777]

I’m betting your truck had halogen bulbs from the factory in the tail lights? And the aftermarket tail lights are LED? 

If so, I bet the tail lights have resistors wires into them (either built in to the light or into the external wiring) and one of those resistors has failed. 

 

So now the truck doesnt see that extra load and is triggering the bulb out indicator (hyperflash)

[Western96]

Yup that makes perfect sense.  I figured it was some thing with the resistance I didn't know about.  Thanks!