foglight switch pinout

[cajunman87]

I wired my truck for fog lights yesterday and wired it into the stock fog light switch, the switch works and the fog lights operate fine, but the little light that is supposed to indicate that the fogs are on doesn't work. I used the pin-out from the website posted below, wire number 3 operates the light on the switch to let you know its on, however it only lights if it is the only wire getting power, if I plug wire 6 to operate the fog lights the light from pin 3 doesn't come on.

http://www.mysporttrac.com/mysportt...ToFordOEMSwitch/PIAAswitchtoFordOEMswitch.htm

 

[onlyme]

wire

the tan/org wire at the fog light switch is for the led indicator in the switch when the lights are on (switch pressed in), just tap that wire into pin 87 on the relay, which should also be the output for your foglights.

the red/blk wire at the switch is for illumination of the switch at night, when you turn your headlights on the switch itself will light up, not the lil indicator. this should be wired into the illumination circuit, red/blk wire that goes to the other switches for night illumination.

so according to that diagram you posted form left to right 3 goes to pin 86 on the relay, 4 goes to ground, 5 goes to the illumination circuit red/blk wire that feeds to the other switches, 6 goes to pin 87 on the relay.

it sounds like you have a wire crossed, wire number 3 is the blu/blk wire that goes to pin 86 on the relay it acts as a ground to complete the circuit and turn on the fog lights.

the relay should be pin 30 battery power, pin 87 output to foglights, and to led indicator wire 6 on switch, pin 86 to wire 3 on switch which acts as a ground to complete the circuit, pin 85 to switched power. this is how it is wired from the factory.

 

[lone-wolf]

the tan/org wire at the fog light switch is for the led indicator in the switch when the lights are on (switch pressed in), just tap that wire into pin 87 on the relay, which should also be the output for your foglights.

The way my wires are run, that would be another long wire I would like to avoid.
Is the connection to ground only made when the switch is closed? Or is always closed?

 

[onlyme]

The foglight switch only completes the ground to the relay when pressed on. Otherwise the circuit stays open, but when the switch is on it completes and closes the circuit. That is only when the indicator will light up inside the switch also. If your truck already has the foglight switch plug in behind the radio bezel, then 2 of the 4 wires are already prewired.

Ford on some rangers, explorers, added part of the harness to some of them, but not all. If the plug for the switch is behind the bezel then 2 of the 4 wires are already prewired. The black ground to the switch and the red/black for the night illumination of the switch. The other 2 wires the blue/black, and tan/orange will run through the dash and terminate at the firewall.

All you would have to do is find the tan/orange wire at the inner firewall plug, and tap into it from there and run it to pin 87 on the relay. Then when your foglight switch is pressed on, the indicator light will illuminate as well.

I have seen people wire their lights 2 ways, with the relay in the engine bay, or the relay under the dash. Some guys have put the relay under the dash, and used the cigarette lighter as their 12v always hot for pin 30, then a switched 12v source for pin 85, and ran the blue/black wire from the foglight switch to pin 86, and the tan/orange wire from the switch to pin 87 on the relay. Then all they had to do was run a single wire from pin 87 through the firewall to their foglights.

From the engine bay you would have to run the blue/black and tan/orange wires from the foglight switch through the firewall to the relay. That is only 2 wires though.

 

[lone-wolf]

The tan/org wire through testing, never has any power. So if I take my red/blk wire(night time illumination), and splice it to the tan/org, then the switch should illuminate when turned on, correct?

I'm worried because the red/blk nightime light is always closed, and requires you to turn on power from your headlight switch to turn it on.
So if the tan/org is the same way, and requires power from your foglight circuit to turn on, then it too is always closed, and would be always on with the headlights.

Everything seems factory but the foglights were not connected to any circuit, and the stock relays were not in place, so I wired them myself to be seperate from the rest of the lighting circuit and to turn on whenever I want. As I heard normally they only turn on with low beams.

 

[onlyme]

No the tan/orange wire has to be powered because it goes to the led inside the switch, so when the relay sends power to the foglights it also sends a signal from pin 87 back through the tan/orange wire to the led in the switch letting you know the foglights are on.

If you splice the red/black wire to the tan/orange then the led would be on regardless if the foglights were on or not, as soon as you turned on the headlights.

The tan/orange wire only lights up the led when the foglights are on, otherwise it stays off, even if the headlight switch is on illuminating the fog switch, the led indicator will not light up unless the foglights themselves are turned on.

Yes factory the fog lights are wired to only work with the low beams as they use the switched power source from the low beams to activate the relay so when the lowbeams are on the foglights can be on, but as soon as the lowbeams are off the foglights will also go off. That is a simple fix though as all you have to do is change the signal to the relay from the lowbeams, to say the parking lights where the foglights can be on with high or low beams, or you can use an ignition source to turn on the foglights on anytime you want.

The red/black wire is only active when the headlight switch is on, and all it does is send a signal to the bulb in each switch on the dash to power them up at night. It has nothing to do with the foglight switch indicator turning on or off. Each switch has it's own bulb for night illumination and a separate led indicator for when that specific switch is active/on. The led though only receives a signal when power is applied to the source.

 

[lone-wolf]

Your not understand what i'm saying.

The red/black wire is only active when the headlight switch is on, and all it does is send a signal to the bulb in each switch on the dash to power them up at night. It has nothing to do with the foglight switch indicator turning on or off.

I know it has nothing to do with the switch indicator, but if the switch indicator is only connected to ground when the switch is closed then you could split the power from the nightime indicator and run it to the switch indicator as well.
But if the switch indicator is connected to ground all the time, then this would not work.
Wish I had your pin out picture when I done it, as I could of tested this all and figured it out quickly.

That is a simple fix though as all you have to do is change the signal to the relay from the lowbeams, to say the parking lights where the foglights can be on with high or low beams, or you can use an ignition source to turn on the foglights on anytime you want.

I just hooked the relay straight to the battery and then ran from the relay to the factory fog light button.

 

[onlyme]

Sorry I think I understand what you're saying. Yes the factory switch is grounded, the ground inside the switch goes to the bulb, the led, and switch itself. Here is a diagram of how the inside of the switch is. Hope it helps.

 

[lone-wolf]

Sorry I think I understand what you're saying. Yes the factory switch is grounded, the ground inside the switch goes to the bulb, the led, and switch itself. Here is a diagram of how the inside of the switch is. Hope it helps.

Prefect, where are you finding these?

 

[onlyme]

I have them saved on my laptop. I found some here http://search.ebscohost.com and the user id/password is tech/tech then you click on the auto repair reference center link, and you can get diagrams and other useful info for your vehicle. Some I also found at Autozone through their vehicle repair guides, that is where I found that last diagram.

 

[backroad101]

Tagging for interest for a future project