I just bought this thing about a month ago and they worked fine. Today, they do not. The 30A fuse is good and I hear a 'click' from the relay when I hit the switch, but maybe it's the relay?
it might seem odd and it actually happened to me. Look over the pedals and check if the wires are not burnt because the spring from the brake pedal ended up catching a wire and shorting the signal wire. with age the electrical tape tends to become less sticky and doesnt retain the wires into place. good luck finding the culprit!!! i couldn't drive my car at night for 6 months because of that.
try turning the knob on the bottom of the headlight motor. sometimes mine dont want to move depending on the position they are in then they are fine for a while. You can also turn them up so they work for now till you get it straightened out.
