I recently built a flatbed for my truck and now the "Lamp Out" indicator is on. But it only comes on if i use my blinker, my reverse or my running/headlights. It will flash onn and off with the tempo of the blinkers. I cant figure it out. Any ideas?

 

Are they LED lights? If so, your probably not getting enough amp draw from them causing the computer to think you have a lamp out.

 

No, they are not LEDs. My buddy wired them while I was finishing up the bed and I'm not sure what he did. I have three wires coming from the light I chose for the flatbed, two coming in from one bulb (brake/blinker/running bulb) and one coming from the reverse bulb.