Ok, I wanted to add fogs to my 2006 Mustang.
I figured I'd have to replace the factory light switch.
But how about the wiring...
There's some sort of light logic board that handles enable of the fog relay
signal (active low) when the lights are on EXCEPT when the high beams are
Now, I could just tap two wires at the light switch, and then put a double
relay under the hood. But does anyone know what the factory 'add on' kit
included? At what point is the factory wiring there and/or what needs to be
By the way, I DON'T like the actual factory lights. I hate the chrome on
the grill, it looks like obnoxious '67 grill with the big tubes around the
horse. I like my plain black grill I have now on my 2006 (and the way I
modified both 1968's that I've owned to have nothing but the horse in the
blackout grill). I'm thinking of small 'slit lights' in the grill that
wouldn't be noticeable when off, with nothing on the front of the grill,
just small slits.
I've not actually decided on the actual light package yet. But I have seen
some pretty powerful 'slit lights' but they were pricey. If I go for 'fog',
I'd probably put them as low as I can. But the switch and wiring issues are
still the same.
Law limits you to 4 projecting beams at a time, so if your car has
high and low beam lamps that light together for high beam, the car
needs to be wired to prevent the aux lighting from coming on on high
beam - for fog light use that is a functional requirement as well as a
legal one. Also it is illegal to drive with Fogs only - so they should
also be wired to NOT come on without the low beam headlights.
For "long range" lighting with 4 bulb headlamps, you would need to
shut off the low-beam bulbs when you turn on your long-rangers.
Ideally you want the factory wiring harness if they are going to be
"fog lights" It is designed to do do it right. I don't know if the
Mustang is pre-wired. The Chrysler PT cruiser is. The Ford
Contour/Mystique was also pre-wired - at least on some models. All
that was required was the upgraded switch, the lights, and installing
a fuse and relay.
In MOST cases it is strictly relay logic - built into the relay/fuse
block so if not pre-wired on a car where the lights are available as a
factory installed option, the add-on kit is a plug-in harness, relay,
Uh, exactly. That's what I was asking. What is in the kit.
My Intrepid, for example was 99% there. I replaced the lowed rubber of the
bumper that came from a junkyard, plugged in the lights, and put in a new
dash switch. That was it.
Ford HAD a kit. But I don't know what was in it.
THAT'S WHY I WAS ASKING!!!
At least in one case an aftermarket kit seemed to include an original Ford
light switch, but for the wire harness you 'vampire' onto two wires and have
to drill the firewall into the engine compartment, then mount relay(s).
In other aspects it seems that Ford leaves the wire harness in the vehicle.
I thought at least it might come to the light logic block, but I'm not sure
if that is in the engine compartment or behind the firewall. THAT'S WHY I
Get a manual or ask the dealer parts department. That's what they are
for - and VERY often the parts are cheaper from the dealer than you
can get them from a third party - even on-line.
As an example, the speed sensor for the left front of my '96 Ranger is
less than 1/3 the price from the dealer as from NAPA On-Line.
Cheaper?? That's quite surprising!
On the other hand, I've seen some suspension parts for my Mustang that from
Ford came in three 'flavors' as to street to full race. But the aftermarket
only came in one flavor, so I wonder which one it was.
Usually I hit the salvage yard. Like I did for my Intrepid. I found a dash
for my 85 Jeep Wagoneer with full instrumentation. $20 and it dropped right
in, and now I had full instruments with tach. All I had to change was the
oil pressure sensor from a 'switch' to analog sending unit. Pretty simple.
I even managed to move the odometer without triggering the tamper pad so I
kept my original mileage. (Had to do a few other minor tricks, but it was
actually pretty simple) For my 99 Cherokee I found the switch bar, but
turns out the wiring went to the firewall, but no further. There wasn't any
wiring in the engine compartment for the fogs, so I need to finish that up.
But, I found that everything was there in terms of wiring for adding factory
cruise except the clock spring. Swapped the clock spring, dropped in
steering wheel switches (but the manuals are all wrong, you have to be
careful, but only about the switches) and the servo. Once I figured out the
issue with the switches, I had the cruise working fine.
I'm not familiar with the local Ford dealer for parts... Long story, and it
involves an ownership change...
When I was a service manager (not ford) I helped a lot of owners
figure out what they needed to do. Helps if you buy parts from the
dealer - and get the occaisional service work done.
I kinda agree. I had a running light kit installed in my Escape by the
dealer. It was a Ford product, made for the Canadian market, and it works
perfectly. That said, I'm not thrilled with the way it was installed, tying
the wires behind the headlights and forcing me to cut the ties if I have to
change a bulb.
I must say I have an excellent rapport with my Ford dealer and find their
prices to be inline with independents on just about everything. And, even
though I was not happy with that wiring job, it does work and they do know
For what you want I would be thinking billet grill with some small mods.
And, I would be surprised if your car does not have a "standard" wiring
harness that covers all models. It's cheaper to make one harness for all
models and just use the plugs you need. If you get decent fog lights I would
have them come on with the headlights as they do an excellent job of adding
supplemental lighting even when the weather is good.
The kits I've been able to look at so far use the factory switch in the
dash, and then they 'tap into the wires and you drill through the firewall.
As far as I can tell, they turn on with the parking lights, and don't care
about the hi/lo beams.
What got me was the kits all seem to 'tap' into the wiring behind the
switch, and not into anything in the engine compartment. Seems Ford put all
the wiring in the dash, but not firewall forward. There was a Ford option
kit for the 2006, but I haven't been able to find what was actually in it.
Would be really nice if it was a wire from the lights to the power box and
the rest was in there.
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