Do you know anything about automotive electronic's ? body control modules , ford's SJB - smart junction box. Do you own a professional scan tool that can read codes in the SJB ? Auto part stores can not read these code's . Do you know how to do automotive electrical trouble shooting ,using a DVOM -digital volt ohm meter ? If not , your best bet would be to take your vehicle to a qualified repair shop.
Principles of Operation
The smart junction box (SJB) sends multiple voltage reference signals to the multifunction switch. When the multifunction switch is in the LH or RH TURN positions, or the hazard lamp switch is engaged, that input signal is routed to ground.
When the SJB receives a request for a turn signal or hazard lamps, the SJB supplies voltage to the appropriate turn lamps.
Do you know what a wiring diagram is ? Free one's here
http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size . Under system click on lighting ,then under subsystem click on turn signal lamp . Click the search button then the blue link .