Aside from the passenger compartment fuse and power distribution panel under the passenger side of the dashboard, your 2003 Ford Expedition has three auxiliary power panels. Auxiliary panel No. 1 is in the engine compartment on the driver side, forward of the wheel well. Auxiliary panel No. 2 is on the passenger side, in the body pillar forward of the rear wheel well. Auxiliary panel No. 3 is on the driver side, under the left end of the dashboard.
The hazard and turn signal relay is in auxiliary panel No. 3. If you get under the dashboard on the driver side and look up high under the dash, you'll see a black plastic cover. Bring a flashlight; it's dark up there. Squeeze the retaining clips and then lift the cover off to reveal the turn signal relay.
