Dick, I'm using the term "taillight" in the more general sense of a light at the tail (rear) of the car. Not to split filaments! I can't explain it, but I invite you to try it yourself: remove the bulb or put a bulb with a bad filament in one of the taillights and see if the turn signal will flash. Unless my 2 Imperials are unlike every other Imperial made, or my memory is really bad, the turn signal indicator on that side won't operate-- i.e., flash. Is it possible this was an intentional design feature? That they put a more sensitive flasher there, in order to alert the driver that one of his lights was out? Mark Dick Benjamin wrote: > The normal load sensitive el-cheapo flasher would be overloaded, thus the > car really should have a heavy duty flasher installed. The heavy duty > flasher is insensitive to load, and will flash whether or not all the bulbs > are working. I suppose it is possible to have a load sensitive flasher so > hair triggered that it will flash with 4 32 CP bulbs plus the two smaller > ones, and somehow know to stop when one of the filaments burns out, but I > rather doubt it. Those who have lesser Mopars with a smaller number of > large bulbs running off the turn signals probably do have light duty > flashers; this will cause the flasher to stop sequencing if one burns out. > Anyone who has followed a 67 around a few corners at night will know what > "wall to wall" taillights means! >