no running light-brake light and blinker not flashing - i have a 2000 gmc sierra that i put led's on they worked fine in the begining but now the left ...

i have a 2000 gmc sierra that i put led's on they worked fine in the begining but now the left side quit working.the left 2 strips wich are the blinkers light up but dont blink the 2 strips on the right dont do anything.i have replaced all the fuses both inside and under the hood and still nothing .i bought these less than a year ago.what could my problem be?

I dont really have an answer for you but heres a free bump to help you out. Welcome to the site.

I am assuming these are tail lights? Well, where do you buy them, or what is the manufacturer? Were they a complete tail light housing replacement or or just bulb replacement? Did you have to do custom wiring or did it use the stock plugs? Some problems with LED having a lower current draw is it made the signals blinks faster, like if you had a bulb out, a resistor has to put in place to correct this. Did you notice any of this or were the blinking correctly? You are specifying the turn signals, but are the break lights and reverse lights LED as well? If so are they working? Honestly the best thing you could do is use a current tester, take the light housing off and test each plug... if you are getting current to the plugs, then it is the lights. If you are having a problem getting current then you need to check the wires back to the fuse box. If at that point everything seems fine, AND ALL fuses have been tested and are good, you need to check you flasher module.