Ok, as i was changing my headlight **** without fog, with the one with fog light switch. I check the wiring too and notice, that the wiring on both switch are also the same. They have the same number of colored wiring (no more, no less) that is also connected to the same connector.



As i was driving tonight i tried to pull on the fog switch and the fog icon comes up, that means the switch is working. But i don't have the wiring connected the the fog light yet.

Now, do i still need to get a wiring harness for the fog, to make it work like factory, or can i just splice one of the wires on the headlight since they have the same wiring and connection from the switch. The only difference is you can pull the switch on the one with a fog. If i do have to splice, which one (color).

Also what part number connector do i need to connect my fog light to wire it. It's an aftermarket fog light.


By the way guys, Does your headlight switch illuminate on the center **** at night. Mine does only on the **** surround. I tried both switch, but it still does not illuminated on the center switch. Is it normal, or i must have messed up some wire. Heres the pic with arrow where it's doesn't illuminate.


Thanks in advance.

 

The center does not illuminate, which explains why they moved the fog light logo from the switch to the surround in newer production trucks.

The foglight switch wiring is going to go to the fuse box, where it will drive relay 202, which is likely missing in your fuse box. There may or may not be wires from the fuse box forward to somewhere in the engine compartment. If there are, all you will need to do is to plug the relay in, add the appropriate fuse, and connect the wire in the engine compartment to the fog lights and ground the other side of the fog lights. If the wire from the fusebox to the front is not there, you are going to have to add it yourself, and decide where to put the relay. It's probably a bit tricky to add wires to the fusebox (they will take a special kind of quick disconnect that latches into the box, which might be difficult to find.) So it is probably easiest to add an external relay and fuse, and tap into the foglight switch wire to drive the relay. The foglight wire will be positive when the switch is pulled out, so the other side of the relay coil should be grounded.

 

Here is the diagram from the '05 EVTM ignore the hand drawn additional ground wire. The line from that side of the coil would go where the stub line right below where it says F35 / 20A.



If you getting the fog lamp icon to illuminate ( if it is on full brightness ) this shows that the circuit between the switch and the high beam via the coil is good ( which means the relay is in the fuse box already ).

If you look under the bumper, if you are on the pass side, it should be in the same harness as the horns, look for the 2 pin connector that matches fog lamp connector ( kind of oval 2 pins ). Once you find this ( if you can find it ) check that the fuse for the fog lamps is installed ( I would guess it is not, but then again I would have guessed that the relay was not in there ), and check for power and ground at the fog lamp connector.

If you cannot find the wiring harness for the fog lamps, we can do an extended connection to the fog lamp relay, and run it this way to under the hood. This is easier then adding the wire to the rear of the fuse box, which is really jsut being careful. The quick connect Male terminals are not that hard to find with the latching pin.

Summary :
1. Check for the fog lamp fuse ( F17 15 AMP I think is what the diagram shows )
2. Give a look for the connector, start on the pass side in the harness for the horns, once located ( and step #1 complete ) check for +12v when the fog lamp switch is pulled out, and the low beams are on.

Good luck, it is good news that you already had the bulk of the harness installed it seems.

Steve

 

First off, UI would reccoment that you pick up a Hella High Performance Wiring Harness Part# 87199. It will work great. Second, If you look at the back of the non fog switch, and the fog switch, you will notice that the fog switch has more pins, right?? On the trucks harness itself, there is one pin that is not used, right?? Once you get the HELLA harness, you will need to tap the LOAD, (which is YELLOW) to the WHITE-BLACK wire in the trucks harness..

 

There is no qualification on the Connector C2150A for pin 9, Fog Lamp relay control, same connector for all main headlamp switch types, so they are the same number of pin regardless of what the headlamp switch type is.

The only qualification is for pin 1, with or without AutoLamps, and this is only for the AWG of the wire.

Why is there a need to tap the AUTOLP SW IN circuit ?
This is the circuit that runs to the VSM / BSM, and the output is the Red w/ Yellow stripe. This connects the 2 circuits ( position 4 ) together to apply power to the head ( position 1 ) of the aswitch, when the Photocell says turn on the lights.
If the route is take to power the coil on the relay on something like the Hella harness, the White w/ Black stripe, will be hot when the low beams are on, and the fog lamps swtich is pulled out. This would be with the switch in the parking lamp position, headlamp position, or the auto lamp position.

Any relay looking for +12v to be applied to the coil would be hooked to the White w/ Black stripe wire, circuit 188 ( this is the power side of the coil on the fog lamp relay, which is pin 9 on the head lamp swtich.
If this is the route with an external relay and aftermarket harness, I would suggest pulling the Fog lamp relay, so you are not powering both ( factory one for no reason ).

-TXF150- does make a good point, that I did not ask about. What is the wattage of the aftermarket lamps you have ?

The factory fog lamps are 21W each. The fuse is a 15A fuse, so with P=V*I, this would make P=180 W max. Reduce by 80% for the continual load rate, and this makes the max ~144 W. If these are 85W lamps, you need to do something external.
This might be as -TXF150- makes note of, or if you find one of the connectors, use this to run somethng like the Hella harness relay coil ( that would be a relay running a relay ) so you would not have to run the wires into the cab of the truck.
Sorry, but that makes 3 things to get answers on, prior to moving forward.

 

I made a mistake whan I said that about tapping the autolamp..

In my first post I was referring to connector C205A, not C2150A.. I am going by the connector that I have in my truck...

radz,
Would you be able to take photos of the back the non fog and fog switches, and post them.. Thanks

 

TXF150

Here is the back view of the switches. Like i said, they got the same number of pin and color coded wire that goes on the same pin connector. I'm also looking to get the Hella wiring harness. I just figure that since the fog switch already worked, maybe i just need to tap in to one of the headlight wires to save some bucks.





Thanks for all the reply guys. SSCULLY, Thank for the diagram, looks like i'm gonna have to figure how to read that, since i'm not good when it's comes to reading electrical diagram.

The fog icon illuminates even on the regular pull of the switch when the headlight is on.
Any idea what kind of part# or connector should i get for the fog light socket itself?


Thanks

 

Obviously the 2004 models have a different connector (12 prong C205A) than the 2005 models... This is becoming more and more confusing...

Top swithch (brothers 2005)
Bottom switch (mine 2004)

 

1.What is the total wattage of the set ? That is going to be the #1 item for if you can use the existing wiring.
2. Did you look under the front bumper for the connectors ?
2.1. I have the same question going in email with Chris since 7-APR-06, and it seems that he does not have the connectors ( or they are really well hidden ) on his '05. I just wanted to see if you had any luck.

3. Don't make it any harder then it really is. Simple as can be.
Here is what we have, and need to check on :

The line in Blue is in and working ( Fog lamp indicator on switch is fully illuminated right ? )
The line is green, at least towards the bumper is what Chris could not find on his '05, so if you could check that..

4. The connector..If you are over ~ 60 W each lamp, doesn't matter, you will be using the harness ( if you can find it ) to hook up to the harness Relay coil ( like the Hella one ) with a direct feed to the battery. This would be a cut and solder / extend item, to get to the external harness relay coil, and a tape job on the other side.

 

SSCULLY
1.The wattage of the set is 12v-42w each.
2. No, i don't have the connector for the fog, which i have been hunting for a long time now. ( I guess FORD must have been hidden it pretty good or it's just not there)

Thanks for helping us out.

 

1. No problem on 42 W that is what I am running on my '06.

2. Chris has the same problem with finding them, on the Passenger Side :
2.1. Pull the headlamp out ( 3/4 bolts, directions in the owners manual on bulb change.
2.2. Follow the wiring harness from the head lamp and front marker lamp down to the horn. The pass side fog lamp connector, on my '06 factory installed, is at a Y in this harness about at the level of the horns.
2.2.1 This is where the plastic loom holder/support is in a hole on the sheet metal.
2.2.2. If this is a single run, then the next place is at S108 up on the firewall. This is where the split between the driver's and Pass side is at.

I do not know if the fog lamp harness is installed, even to the point if it even leaves the fog lamp relay in the CJB.
This is splice S108 :


The splice would be QTY:3 ; Tan with Orange stripe wires ( or 1 wire that has an inline type, solder splice attached to it ).