68 a-body left indicator pulses

The fender mounted signal plugs into the harness going to the turn signal, again the light green wire off the back of the left signal harness, you'll find a short pigtail. First try unplugging the signal flasher, if it still lights up move the signal lever and see if it changes, then unplug the signal switch (harness connector is to the left of the steering column.After all this if it still is light, the problem is from the bulhead connector to the front lights and not in the car.