Watch the lights while a helper presses the brake pedal and you'll see unusual things happening. Suspect a bad ground. After the current goes through one bulb, if it can't get to ground, it will find a way there through another bulb. When that second bulb is turned on, voltage appears where the first one had found a ground. When voltage appears on both sides of the first bulb, it turns off.
Thursday, March 11th, 2010 AT 8:16 PM