Scott,
Since it 'ran when parked' (catchy phrase isn't it). I'll come back to the theory that the wire supplying feed is not providing current all the time (loose connection at the clock or some place else, insulation gone someplace and making intermittent contact with ground, etc.) When driving, the movement of the car causes this disruption in some way (bumps, potholes, etc.).
Gary-
Since it 'ran when parked' (catchy phrase isn't it). I'll come back to the theory that the wire supplying feed is not providing current all the time (loose connection at the clock or some place else, insulation gone someplace and making intermittent contact with ground, etc.) When driving, the movement of the car causes this disruption in some way (bumps, potholes, etc.).
Gary-