My 1998 Dodge Grand Caravan has a REALLY weird electrical problem with the driver's side turn signal. The signal works properly except when the headlights are on AND you're stepping on the brake pedal. If the headlights are on and your applying the brakes the left turn signal will flash double speed as if the signal bulb was out, but the signal is actually flashing double speed and the reverse lights on both sides flash with it! What makes it even weirder is that the bulb checks fine on a multi-meter, but if I swap it for a "new" bulb the problem disappears for a week or so. I recently replaced the left side tail light housing with a Dorman replacement part. I am completely baffled. Does anyone have any suggestions??