Headlight wiring for 2005 F250

Hi Everyone, I was looking for the wiring diagram for the headlights of a 2005 F250. I hooked up an Avic Z1 to my friends F250, and I'm having a very weird issue. After installing it, the headlights don't work when the key is on. When the key is off, the lights work fine. But as soon as you turn on the key, the headlights go off. Also the parking lights work all the time. And if you try to put on the high beams, truck on or off, the interior light comes on telling you the high beams are on, but if the key is on the lights outside are not on. Very weird. I checked all the fuses and wiggled the connectors in the fuse box and the back of the dash connectors. I guess I will start tracking down power through the system, but I don't have the wiring diagram for the truck. Any help or insight would be appreciated.

Im guessing that you do not need a diagram for the headlight switch.....you need to check your install. You have tagged on to something you should NOT have. Maybe cosider listing your connections. You made the comment at the end of your post about NOT having a wire diagram for the truck.  Does the Z1 work correctly?

Actually I would like the diagram for the headlight switch. OR anything else headlight related if it's easy to come by. This is a friends truck, he is on vacation, so I "stole" it (without his knowledge) to put this in as a surprise. He is going to get back from vacation and SURPRISE no headlights! :) That would be a big surprise. The Z1 works perfectly. No problem with that at all. The truck does not have automatic headlights, but it does have factory fog lights. The Z1 was installed by connecting most of the wires through the stock radio harness (power, ground, dimmer, speaker, power antenna). The only 2 connections I made outside of the radio harness was the VSS and the reverse sense. The VSS, there was no VSS wire on the harness (like there was in my lincoln) so I took it from pin 21 on the antilock brake harness, it was BLACK/ gray just the same color as the one in the wiring harness of my lincoln). So I tapped off that. The reverse wire I took (with someone else's recommendation) off the back of the fuse box (which I had to drop to get to) with a BLACK/ pink wire which I metered out to see that it was 0v normally and 12V in reverse. For the reverse camera. Every other connection was at the radio harness. No the Z1 wants an ILLUMINATION wire and the harness had a DIMMER+ which I figured might work. Someone else who installed a Z1 into a F250 said they did it and it worked. So I did that. It seems to work, but could it be interfering with that wire some how? I don't know. My next plan (when I get home from work tonight) is to remove the radio and see if that helps. I pulled the dash back apart and checked all the connections and wires, they seem fine. I pulled out the fuse box again and checked all the fuses and connectors on the back and they seem fine. When the key is off, the lights work fine. The (factory) fog lights work fine too. When the key is off, the fog lights work but the headligths (high or low beam) do not work. Only when the key is on. If pulling the radio out doesn't fix it, then I will have to start tracing back the headlight power through the truck and see if I can find where it goes and when it stops. The one weird part is that my buddy had someone put in a crimestopper "cool start" remote start device, which is back in there. It's all tapped into the steering column wires. Nothing looks cut, just tapped into. The guy got ground for this by jamming a wire under the fuse box bracket so when I remove it, it lost ground. I hooked up a good ground to it at a grounding point to the right of the driver's knee behind the dash. And that seems to still work, so I don't think I messed up with any of that or that it could be causing the problem. I'm guessing it's something I did. Again, thanks for taking the time to look at this. I'm not a huge idiot (usually) but this problem has me stumped and without a wiring diagram it's a little hard to troubleshoot, I guess I might have to buy one. I was hoping someone else might have heard of a problem like this.

ducatiboy wrote: When the key is off, the lights work fine. The (factory) fog lights work fine too. When the key is off, the fog lights work but the headligths (high or low beam) do not work. Only when the key is on.

Sorry that should be: When the key is off, the lights work fine. The (factory) fog lights work fine too. When the key is ON, the fog lights work but the headligths (high or low beam) do not work. Only when the key is on.

VSS WIRE	Gray/black	At Powertrain Control Module	8000ppm
Pin-68 on the F150 and F250, Pin-58 on the F250 and F350 Superduty. The PCM is located on the driver's side of the firewall.

First thing I would do, is unhook the dimmer conection you had made....

Ok, this is MESSED UP! I pulled the dash off, headlights still working weird (I checked with the key on and off, high beams and low beams). Pulled off all the connectors off the switches off the dash (except for the headlight switch), headlights still working weird. Put the shifter into 1 (drive low) to move the shifter out of the way to get the dash further away from the radio, headlights still working weird. Started the truck and noticed that while cranking the headlights came on, but while "on" no headlights. I shut the truck off. Pulled out the radio, unhooked everything from the radio to the truck's wiring, headlights still working weird. Moved the shifter back to park, headlights still working weird. And now I noticed I couldn't get the key all the way out. Started it again, lights on while cranking but not while the truck is running, shut it off. Still can't get the key out. Key is off but not all the way off so I can get the key out. Turned the headlights on, turned the key on and off a few times, still can't get the key out and the lights went off everytime I turned them on. Till one time, lights stayed on and the key came out. All in one shot. I wasn't touching anything but the key. Could there be something loose in the steering column? Weird!

Ok, I figured it out.... well I didn't figure it out... I ended up talking to my friend and ruined the surprise and told him what happened and how I wan having problems and how the headlights just "fixed" themselves. My friend asked "Did you hit the plow switch?" He has a plow on this thing (not now but it's wired for one) and there is a toggle switch under the dash which switched the headlights from the truck to the ones that are above the plow. I must have hit that by accident. I feel like such a retard! I went out and tested it and yes, that is what that toggle switch does. Oh well, at least I figured out my problem. The wiring up of the Z1 and the interface with the truck is perfect! Thanks for the ideas!