I also wanted to mention that all the lights are on: the front, the back, and the parking (front and back). The fog lights are also on, but there is a separate switch that does turn these off, but all the other lights remain on.

The relay for the automatic light system is stuck on. It's supposed to turn the lights on when it gets dark out.

Were is the relay located? I checked the power distribution box and it isn't in there.

Do your headlamps stay on all the time, or do they time out after a couple of minutes after ignition turn-off.? If so, try this: Turn the lights off before shutting off the ignition.

If your lamps are staying on permanently after: 1) ignition shut-off, and then 2) light switch shut off, suspect something in the headlamp-off-delay feature. (This assumes that your vehicle is equipped with this feature.)

Just wanted to give an update on my troubleshooting. I put the fuse back in and all the exterior lights remain on. I pulled the relays in the power distribution box one by one to still see that the lights remained on. I have looked in a Haynes manual and can still not locate the relay module. The relay I am looking for is the one that controls both the park lamps and the headlight lamps. Does anyone have an idea of where it could be located?

So,why don't you phone the dealer and ask them ?

The headlight relay is inside the "Relay Module" behind the center of the dash.

Consider the likelyhood that BOTH relays have failed at exactly the same time.

Now go and find out what turns them on and how.

I have switched out the relays with others that have the same part numbers on them with no luck at it turning off the lights. I also just ran a continuity test between the terminal #2 on the headlight relay (where the power comes from when the relay is energized) and a ground. Since there is continuity, I am guessing I have a short and need to replace some wiring. On the back of the relay module, does it have connectors that plug into it? I am hoping I can get a section of the wiring harness to replace instead of having to run an individual wire.

Please let me know your thoughts.

Hi again Fred.

First, do you have auto dimming headlights? If so, unplug the connector from the rear the rear view mirror and see if your lights go out.

Now that's the last "silver bullet" that can be thrown out. All too often I see people make light of what a tech has to do today to repair someones car. You don't have to read too many threads right here in this forum and you will see just how rare it is to get respect for what we do. We DON'T just swap parts as you did by playing musical relays in order to figure out a problem with someones car. You should have noticed though, that when you were plugging the relays in, they probably clicked because they are "being commanded on". This command could be a false one such as a grounded wire. We don't actually call that a short because shorts blow fuses, that's not happening here.

Looking at the schematic, and not knowing for sure which system you have (there are two designs, one with auto dimming, and one with just Daytime Running Lights) makes it impractical for me to type out each step to lead you to diagnose this thing. Seriously, it would take me about 1/2 an hour to diagnose it, and three hours to type it all out. Average pricing for a tech/shop to diagnose this issue around here would be in the $100 range.
Keep in mind things like "Flash to Pass" and the fact that the multifunction switch is a significant part of the circuit. Any aftermarket alarm systems, could also be in play. I'm not going to be able to go into great detail, make sure there are NO blown fuses in any of the vehicles fuse blocks. A blown fuse would of course be evidence of a short occurring somewhere, and this can result in a back feed which can command a relay on.

Later today I can look closer at what you have written here again. But if you don't have the skills to do the diagnostics on electronics at this level you should plan to have a tech repair this. JMHO.

To who can help I have a 2000 expedition and the lights won't go off even when car is off what do I do

I have a '93 Lincoln Town Car and the headlights stay on even when the car is off - any thoughts as to the problem ... we did switch the control knob and dimmer switch and checked the fuses still ... told to check the relay(s) ... Your thoughts and advice ...

99 percent sure that's happened to me twice it is your GMC box

Hi I have a 2000 mustang 3.8 every thinks works great until today I parked my car in an underground parking lot and now headlights won't go off unless I pull the fog light fuse any ideas thanks

The problem we have is that technology is advancing faster than engineers or mechanics know how to fix. When Steve Jobs had one of his computers freeze on him at an expo, although he and his crew built it, he didn't know how to fix it. Embarrassingly, he had to admit, at least in that moment, that he was in over his head. That is what we are experiencing here with these computerized cars. If, during an accident, I were to drive into a lake and drown because I can't electronically open my window, then it would be better to have an override manual handle for just such an instance. I have had to replace multiple batteries because my 1998 Ford Explorer headlights remain on for at least five minutes after the car is stopped in daylight or dark, without fail. If I open up the hood and unplug the battery everytime I stop, I might save a battery, I suppose. However, the thought of this is disappointing. It is just surprised that after six years of ignoring it, I come on Google and find no solutions to this problem that Ford should have addressed long ago. John G, I respect what you said and hope that you figure out what to do about this for the benefit of us all. At this time it appears that there are no solutions to this matter on google/youtube. I will soon contact Ford. If Ford wants to keep the business of its customers, they will respond.

I have 94 mark Vlll with the same problem..my solution was to install an in line fuse holder and put a toggle swith on the dashboard..it solved my problem but I have no instrument lights yet..a jumper wire to the dash lights will fix that..no othet solution was obtainable from anyone even at the ford deslership service dept

try replacing the driving light module.

I agree with Kalining45, but much time has passed, so answer is untimely....
Then can you describe how you fixed up your car?

I have a 2004 Ford explorer ”Rddie Baurer Edition” some how my headlights wont shut off once my vehicle is started and once i shut it off. i was able to manually turn them off and off now they come on automatically. how do i get them to where i can manully turn them on/off?