There are 2 ways to stop the LED flicker.
1. Install a resistor
2. Use a relay, you can wire to factory switch to fire the relay.
Since my LEDs draw less power than the factory fogs, I elected to go the simpler and cheaper route of installing a resistor. I used a 10watt 100ohm resistor and wired it parallel to the LED. In other words I soldered one end of the resistor to the negative side and the other to the positive wire. I then protected it with shrink tubing and wire loom. The resistor will get warm to the touch when the lights are on (that's what resistors do), but not too hot to hold in your hand.
You can buy the resistor at any electrical supply store or at Amazon
http://www.amazon.com/Amico-Axial-W...=1440349069&sr=8-13&keywords=10+watt+resistor
If you search for LED flicker, you'll find more info.
Also, when I called Rigid tech support about this issue they recommended that I buy an anti flicker warning canceller harness. I tried this method, it slowed the flicker, but didn't stop it.