I have noticed sometimes that ALL the lights come on or go out.
Is this the same thing as burned out bulbs? or is there a switch in the unit that turns these lights on and off? Somtimes the unit brightens up on it's own and then dims. Similar to the pressing the bright button on the end of the blinker stalk.
Well anyway...... How do you know if it's the bulbs or some other switch thing in the unit?