Ford Repair Questions? Ask a Mechanic for Answers ASAP
If the left rear turn signal is not working, you will need to check the wiring to the left rear. The best and easiest way is to take the right rear turn signal bulb and socket, unplug it and plug it into the left rear and see if the left rear still flashes fast. If it does, inspect the wiring at the turn signal switch. The wires are known for pulling out of the connector on the switch over time.