Next they can be checked at each end for resistance and continuity. The fusible links can be pulled on gently to see if any sections feel 'spongy'. It can still cause a plethora ofor issues, but it was not the cause behind mine. With the notoriety these things have for water infiltrating through the lower passenger edge of the a-pillar, I figured it was my best bet. The interior fuse box actually has layered pass through circuit cards built into it. Now, given the variety of issues and routing all of the circuits I found only a few points that one point of failure could affect all of those circuits. Starter relay clicks, but engine does not crank Symptoms (can be all or some of the following): If you don't care much for reading, skip to the SOLUTION heading. After spending probably a hundred or so hours going through electrical diagrams in my FSM testing circuits, cards, wires, connectors and becoming frustrated beyond belief, I finally found the issue. I found many threads on the issue, but never a resolution for those of us that had a problem beyond a simple relay or the likes. This issue affects both Ford Expeditions and Lincoln Navigators. Alternatively, you can try searching online for a diagram or video that shows the location of the fuel pump drive module in a 2003 Navigator.I have searched the Web to no avail. If you are having trouble finding the fuel pump drive module, you may want to consult your owner's manual or a repair manual for specific instructions. It may be labeled as the 'fuel pump relay' or something similar.

Locate the fuel pump drive module: The fuel pump drive module will be a small electrical component with a series of wires connected to it.

Use a screwdriver to remove the screws and carefully lift off the panel.

Remove the panel: The panel covering the central junction box is usually held in place with a few screws.Locate the central junction box: The central junction box is usually located under the driver's side of the dashboard, near the steering column.Here is a general guide for finding the fuel pump drive module in a 2003 Navigator:

To access the fuel pump drive module, you will need to remove the panel covering the central junction box. The fuel pump drive module is typically located in the central junction box, which is located under the driver's side of the dashboard.

2005 expedition fuel pump location