Where is the turn signal relay located on a 2004 Ford Expedition?
The turn signal relay (aka flasher) is located behind the
instrument panel on the driver's side. It's directly above the
emergency break on the inside portion of the panel, about six
inches below the level of the headlight switch. You can reach it
with your right hand if you sit on the door threshold with your
back to the seat.
The flasher is covered by a black plastic box that's about 3"
long and 1 1/2" wide. The cover is held on with plastic clips on
the ends of the box. To remove it, squeeze the tops of the clips in
pretty hard while gently pushing the cover up. (It tried squeezing
the bottoms, pulling, etc. before figuring out that I had to
Once the cover is off, it's pretty easy to pull out the flasher
and insert the new one.
Tip: A rapdily blinking turn signal may mean you have a signal
bulb burnt out. Check your bulbs before replacing the flasher.
I believe this information is accurate for 1997-2006 Expeditions
and, probably, F150s.
Despite spam entries to the contrary, this information is not
available in your owner's manual, and you definitely DON'T need to
contact a dealer. This is an easy do-it-yourself job.