Mine is the one that has auto lamps and foglights. Much better price. Thanks for the link. Before I order I want to find and make sure that I don't have a blown foglight relay. I have no idea where to look for the foglight relay though.

 

Both headlamps are inoperative
Battery junction box (BJB) fuse 10 (30A) (Excursion).
BJB fuse 13 (30A) (F-Super Duty 250-550).
BJB fuse P (30A) (Motorhome).
Headlamp switch.
Circuitry.
Multifunction switch.
Go To Pinpoint Test A .

The low beams are inoperative
Central junction box (CJB).
Circuitry.
Multifunction switch.
Daytime running lamp (DRL) relay 1.
Go To Pinpoint Test B .

The high beams are inoperative
CJB fuse 16 (15A) (F-Super Duty 250-550 and Excursion).
CJB fuse 35 (15A) (Motorhome).
Circuitry.
CJB.
Multifunction switch.
Go To Pinpoint Test C .

One low beam headlamp is inoperative
BJB fuse 23 (10A) (RH Excursion).
BJB fuse 21 (10A) (LH Excursion).
BJB fuse 11 (10A) (RH F-Super Duty 250-550).
BJB fuse 9 (10A) (LH F-Super Duty 250-550).
CJB fuse 25 (10A) (RH Motorhome).
CJB fuse 31 (10A) (LH Motorhome).
Headlamp bulb.
Circuitry.
Go To Pinpoint Test D .

One high beam headlamp is inoperative
Headlamp bulb.
Circuitry.
Go To Pinpoint Test E .

The headlamps are on continuously
Headlamp switch.
Circuitry.
Multifunction switch.
CJB.
DRL relay 1.
DRL relay 2.
Go To Pinpoint Test F .

The high and low beam headlamp is inoperative on one side
Circuitry.
REPAIR circuit 57 (BK). TEST the system for normal operation.

The flash-to-pass feature is inoperative
Multifunction switch.
Circuitry.
Go To Pinpoint Test G .

 

The fog relay is in the CJB (the fuse panel under driver's side dash).

 

Here is all the fuse panels

 

amiller, that's a nice pdf, but I think his is a 2002. I know mine is, and I'd sure like to have that same pdf for a 2002! hint, hint, if'n you happen to have one. They are definitely not the same as the '01.

 

I ordered one today for $46.

 

According to the book that comes with the truck the foglights only use fuse #43. That fuse is good. They don't list a relay for the foglights but the schematic on my service DVD does show a relay. Where it is located is the mystery as all of the relays in the CJB are listed in the book as being for other equipment.

 

Alan,
Behind the headlight switch on one of the wires there is a diode inline. Any idea which way the arrow should be pointing, towards the switch or away? The reason I ask is dummy me pulled it out of it's holder and forgot to make sure which way it was pointing. I can't read a schematic to save my life.

 

The bar should be on the opposite side of the switch and the arrow should be pointing away from the switch.

And you should be able to follow that wire (in the direction the arrow is pointing) all the way to the relay. Will be difficult with all the loom on it but the relay is labeled K26. I, like you, found it on the schematic but could not in the vehicle. I am thinking it must be contained within the large K126 (accessory) relay. That's just a guess though.

Good Luck

 

I saw the K26 relay on the schmatic and I did try to follow the wire as far as I could. It goes up and then i think through the firewall, after that I lost it. Thanks for the advice on the arrow for the diode. I will check and make sure that I have it in the correct position.

I am going to try and find it one more time, make sure the diode is correct and if I still have no luck the truck is going to the dealer next week on my day off.

 

I got my new headlight switch the other day and headlights still don't work. This switch is supposed to be the right one, but it indicated BA on the back where I think mine is AA. It also pulls out like it controls foglights, my current switch does not pull out. The running lights still work with new switch, just no headlights. Could this be the wrong switch and if it was would it still not work the headlights? If it's not the switch, where should I look next? Any help would be appreciated, thanks.

 

These are #'s for my '01

Without Fog Lamps & Without Autolamps . 1C3Z11654AAB

With Fog Lamps & Without Autolamps . 1C3Z11654BAA

It sounds like you have a short it the circuit somewhere if the new switch behaves the same.

Austin