from:
http://www.ford-forums.com/electrica...me-module.html
The problem as it turns out is the badly rusted DRL (daytime-running-light module) which is below and behind the radiator, unprotected from the elements. As it is so rusted, seemingly difficult to remove (esp. due to the corrosion) and not available (so far) ... I came up with another solution to light the running lights, thus rendering my vehicle visible from the rear at night. The solution lies behind the headlight switch. I connected the (green) power wire to the running lights via a connector fuse, thus bypassing the defunct DRL. It now functions so that when the head lights are the running lights are on. Problem solved, however now when the drivers door (only) is opened the chime unit goes off believing the headlights are on (which they're not until I turn the switch) ...