I was asked by another member if it could be done to have the fog lamps on with both the low and high beams ( not drop out like the factory function does ) on a '05. The answer is yes, and it is not that hard to do.

The standard diagram for the fog lamps ( this is the '05 EVTM, worked on my '06 that I took the pictures on for documentation ). It might work on a '04, I have not had time to look at the EVTM for a 2004, to see if it is the same.

In the Central Junction Box ( CJB ) the Fog Lamp Relay is 202, top row of 3 Relays with fuses inbetween, it is the center Relay.
The Fog lamps turn off, when the high beams are on. This is due to the fact that the Fog Lamp Relay coil is grounded via the high beam elements. When the high beams are turned on, both sides of the coil for the fog lamp relay have power, and the coil drops out, thus the fog lamsp turn off.


I just modified the Fog lamp circuit, so the ground on the Fog Lamp Relay is on at all times. This is done via the pigtail, as the pin 1 ( ground side of the fog lamp relay coil ) is inside the CJB.

Modification of the Fog Lamp Relay :



I used trailer wire, as I have a spool of it. Use any 16 AWG wire you want, it was just handy that I needed 4 wires, and these were bonded together.

The Relay that is being extended :



Make note of the pin numbers on the end of it, and place them 1:1 back into the CJB, with the exclusion of Pin #1. That is the one to the ground lug.



I had to file down the terminals I had.
1 had to be smaller width wise, to match the pins on the relay.
The other 2 I just took of the lip on the side, so I could insert them all the way into the CJB. Take the time to find the correct width Male Spade terminals, for a better fit, or be a bit more careful them me filing them down, I went a bit too far.

Cont in next posting

 

When you look at the pin end of the relay, you will see the numbers on it. 1-2-3-5.

I used the color code to pin assignments :

1=Green = Ground lug
2=Yellow= pin 2
3=Brown=Pin3
5=White=Pin5.

When installing the pig tail into the CJB, just hold the relay up, as if you were going to plug it in, and install the male spade terminals one at a time.



There are only 3 that get installed in the CJB. The green wire or what ever color you used for pin 1, gets installed to the ground lug below the CJB lower right hand corner ( need to pull back a bit on the kick panel part left to get a clear shot at it ) :



I know I just shoved it under the lugs that were there for testing. Take the time to put that fork under the bolt with a socket and ratchet. Looks to be a 7mm, but double check it.

With the wires placed in the CJB, and the Pin 1 wire placed under the ground lug, that is it. Wire tie up the pigtail, maybe add a round of electrical tape around the base of the Fog Lamp Relay, and put in back into the kick panel so you can get the CJB cover and kick panel cover back on.



That is it, as long as you followed the 3 pins into the CJB and the 1 under the ground lug, now when you pull on your fog lamps, they will operate with them in the parking lamp position, low beams ( as normal ) or now in the high beam position of the MFS. This means when you FTP your lamps, all 3 will be on, low, high and fog lamps.

Few picture in the last album in my gallery, if you want to see the sizing of the male spade terminals, or the likes.

Please feel free to ask questions, or comment on my wirint skills. Typos are to be expected.

 

Thanks Steve.Your a genius!I still can't believe you chanced that wiring experiment on a brand new truck!I think maybe your a little crazy too!! Thanks again for all the help you have provided to me.Bob.

 

I got a $9.00 kit off of ebay that does the same thing and only took about 5 minutes to hook up. Works great and has a 3 year warranty.

 

Steve's way was free.

 

It has 2,000 miles on it, no longer brand new

Kind of thought that went without saying

Glad it turned out. If you wanted to pretty it up, could have gooten the relay base from Ford that matches the relay, but I did not see the need for it myself.

Enjoy all that light

 

2000 that's it?! I have almost 21000 on mine already!

 

Obligatory stupid question time:

Why have the foglamps on at all times? And why alter wiring to have 'em on all the time?

 

Quintin,

That is note really an accurate ( full ) description of what the mod does.

More so the thread title should be Fog lamps on with low and high beams ( don't drop out with the high beams like the stock function does ).

I'll see if I can edit the title of the thread, so it is more accurate.
EDIT: Nope can't edit the title of the thread, learned something new today

Thanks for pointing that out, I was jacked up on caffiene and B-12 so things were a little skewed when I wrote this

Steve

 

I only drive to & from the airport once or twice a week( 4.5 miles each way, I have to drive around ORD to get to the parking deck ), and on SAT I drive about 65 miles round trip going to my parents to help them with stuff.

Aside from that either it is one of the motorcycles ( running errands ) or a taxi ( going out ). I only use the truck for errands when it is large load or rain / snow or below 18* F.

 

Not to take away from SSCULLYs project but another member here posted how to do this before and it only requires adding one wire instead of four. Here is the link to his site http://users.cableaz.com/%7Ekinzerfo...og_Lights.html

 

This is the exact thing that I did, but I did not think to bend the pin around, as I did not know if the relay would put up for it, and I really had no idea that it would clear the fuse panel like that.

I would have thought that the coil might have snapped off inside the relay for putting that much pressure on it ( turning the pin 180*), guess it works just fine. .
Nice quick way to do it, and get to the same point.
This is what his diagram would turn out to be, compared to mine above :


I posted the diagram and the URL in my 3rd album, so I have it for ref material :
https://www.f150online.com/galleries...3912&anum=2028

Thanks for the info and the URL

Steve

 

No problem, figured I would just post up another way to go about getting the same results.

 

hello both ways are good but i need ssculys way because i,m still under warrenty ( bad spelling i know ) thanks to both of u

 

Steve,

As usual, great stuff, well explained and very complete. One question though. Knowing how many folks have had problems with their MFS without any additional load placed on them, do you think this might negatively affect it? Thanks!