Sounds like you've done some of this, but here's a good troublshooting list.
Bulb Troubleshooting (check in this order):
· Check Fuses
· Check Bulbs
· Check Relay(s)
· Check Light Switch(es)
· Check license plate light bulb and wiring
· Check trailer hitch wiring harness
· Check all wiring harnesses and wire
Most likely its the fuse or a burnt bulb breaking the circuit. See sources and related links below for bulb information. Sometimes the license plate and/or the trailer hitch is wired into other circuits and can cause issues in other areas. Sometimes its wires grounding out somewhere on the vehicle. See sources and related links below for bulb information. See owner's manual for location and identification of fuses.
Try checking the turn signal flasher. Not to be confused with the hazard flasher.
The fuse panel in the 2002 Ford Explorer Sport - 2 door is on the drivers end of the dash Open the drivers door and look at the drivers end of the dash , you will see a removable plastic cover panel for the fuses
According to the 2003 Ford Explorer Sport Trac Owner Guide : ( # 9007 bulb is used in the headlights )
The standard headlights use one 9004 bulb per side, while the sport headlights use two bulbs, a 9004 and a 9007. Light output is better with the sport headlights. This info is for model years beginning in '94 and '99-01 sport headlights. Retrofitting requires adapting the wiring to the two bulb system and cutting some sheet metal behind the headlights for clearance.
According to my 2001 Sport Trac Manual Fuses 4,5,23 @ 32 are not used for anything.
You can view the 2003 Ford Explorer Sport Trac owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides The fuses and relays section starts on page 137
One or two front turn signal bulbs is busted. Check your front turn signal bulbs and replace it.
You can view the 2003 Ford Explorer Sport Trac owners manual on-line at : www . motorcraft service . com ( no spaces ) Click on Owner Guides ( the fuses and relays section starts on page 137 it has the diagrams and lists )
The fuse for your 2002 Ford Explorer Sport is similar to that of the 2001 Ford Explorer Sport.
You can view the 2005 Ford Explorer Sport Trac owners manual on-line at : www . motorcraft service . com ( no spaces ) Click on Owner Guides ( the fuses and relays section starts on page 188 , it has the diagrams and lists )
The dash light fuses for a 1995 Ford Explorer Sport 4x4 are located in the fuse box on the driver's side. Open the driver's door to access the cover for the fuse box. Look for a fuse labeled instrument panel.
A Ford Explorer Sport is a 2 door model, while the Explorer Sport Trac is a 4 door model with a small pickup bed.