One problem related to turn signal has been reported for the 2003 Ford Windstar. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Ford Windstar based on all problems reported for the 2003 Windstar.
Right side (passenger) front marker light has a grounding problem. I changed the bulb twice and the problem still occurs. The light stays on for no reason and the onboard computer shows that all lights are fine. If you bang it will go out.