LED tail lights

I am installing a new tail light in my truck.. There was no trouble in hooking up all the correct wiring. back up-stop-tail-turn. however when I turn on the turn signal they blink real fast as if there was a bulb out. Now I know the signals use resistance to determine the blink speed intervals. I have tried using a 2k resistor and they still blink fast just dimmer.. what am I doing wrong?

i think the leds might not have enough resistance. i tried those led 1157 bulbs on my truck, and it did the same thing. i have a 1992 chev truck, and as you know the brake and signal light use the same bulb, but at the time i had a ZR1 rollpan, and this had 2 bulbs per side, when i put the led bulbs in, the signals would flash fast, and believe it or not, my astrostrart would not start my truck.  the error code i was getting on the remote start said "brakes applied". the second i took out the leds,,,it started as soon as i hit the remote. now i also tried a heavy duty flasher, but it didn't work for the starting problem, and i can't remember if it helped with the fast flashing, but it is worth a try. these are usually used when you have a trailer with all the lights.

www.lambertenterprises.com The link sends you to a site that makes LED systems for rods. They also make a load box (basically 2 sand block resistors on a board in parallel to ground) which will give the proper load to your flasher. Easy hookup- the two green wires go to the front turn lamps (one to each) and the black wire to ground. If I can find the open one I have, I'll look up the values so you can just go get the resistors yourself.

OK.  I figured it out.  thanks for all the help.. It looks like there was a special lights out safty curcuit built into the electrical system. I tryed using resistors of all sizes. But that didnt help..I ended up removeing the curcit and adding in a new old fashoned flasher to the system...  problem fixed.  slow flash.