This is an interesting one. I have to be honest, I think I would start by testing the indicator flasher relay first. If it's good, the I suspect the multi function switch (turn signal switch) is bad.
I attached a pic below that shows the relay and location. Also, here is a link that explains how to test a relay:
Let me know what you find. Also, here are the directions for testing the switch. The attached pics correlate with the directions.
2003 Ford Truck Explorer Sport 2WD V6-4.0L VIN E
Component Tests and General Diagnostics
Vehicle Sensors and Switches Sensors and Switches - Lighting and Horns Turn Signal Switch Testing and Inspection Component Tests and General Diagnostics
COMPONENT TESTS AND GENERAL DIAGNOSTICS
Introduction To Component Testing
Multifunction Switch, Turn Portion
See pic 2
See pic 3
Images (Click to enlarge)
Saturday, July 18th, 2020 AT 7:24 PM