Occasionally when the headlights are on, the left signal stays lit constantly. The outside front and back lights stay on and the dash signal stays lit. If the lights are turned in the off position, the signal works properly, but the dash and console lights blink in unison with teh turn signal. This does not do it everytime, but will come and go at random with each start of the vehicle. We have tried new bulbs and flashers and neither is making a difference.