Wiring fog lights into my truck - Ford Muscle Forums : Ford Muscle Cars Tech Forum
 
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post #1 of 9 (permalink) Old 07-24-2013, 08:12 PM Thread Starter
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Wiring fog lights into my truck

I have a 92 f150 and the front bumper is the one with the cut outs in it. I like the f250 and 350 fog lights in the early 2000's style. If I make mounting things for them to bolt on in my bumper holes how hard would it be to wire them in? I'd like to have it like normal fog lights that are on with parking lights and low beam and turn off when high beam are on. And how many wires are coming out of those fog lights? 2 or 3? And if 3 what is the third wire for
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post #2 of 9 (permalink) Old 07-24-2013, 10:07 PM
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Re: Wiring fog lights into my truck

Normally, the fog lamps would be wired with a separate switch tripping the fog relay, and the high-beams forcing the relay off. Wiring for that function would not be difficult, but two relays instead of one if you wanted them on with only the headlight switch instead of a fog light switch, yet still turn off with high-beams. [EDIT - I had a brain-fart. It can be done either way with one relay, but I still need to know if you want them on with the headlight switch only, or anytime you flip a fog light switch.]

If you are really sure you are going to do this, tell me if you are going to use a separate fog lamp switch or not, and I can make you a wiring diagram in the next week or so. And, I checked a 2002 F-150 and the fog lights have only two wires, power and ground. 99% of fogs are that way. A few specialty versions out there have lo/hi beam (driving/fog), and a few have a dim "city light" mode, but I assume you are using standard 2-wire fogs.

David

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Last edited by PSIG; 07-25-2013 at 08:34 AM.
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post #3 of 9 (permalink) Old 07-25-2013, 11:14 AM
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Re: Wiring fog lights into my truck

OK, I had a break this morning and made a diagram you can use either way. The GRN/BLK high-beam power wires are in your truck - splice into one of them anywhere before the headlights.

If you want to have the fogs on only when you turn on park lights or headlights, then skip the switch and run the relay #86 terminal to one of your BRN clearance light wires.

This wiring allows fog lights anytime you want them by flipping the switch, but off when using high-beams (or using the passing switch). The way this works is to ground the relay through the high-beam headlights to ground. When you use high-beam, power comes on the GRN/BLK wire. With 12v on both relay terminals 85 and 86, no power flows in the relay solenoid and it switches off and remains off as long as power flows to the high-beams.

David


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post #4 of 9 (permalink) Old 07-25-2013, 01:14 PM Thread Starter
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Re: Wiring fog lights into my truck

i got a little confused when i read this. are you basically saying find the relay for my headlights and wire into what the low beam goes into? not quite sure what you ment. what i want to do is wire it to the normal headlight switch. i only want to use one relay. i want ot be able to turn either my parking lights on or headlights and have the fog lights come on with it and when i switch to high beam the fog lights will go off.
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post #5 of 9 (permalink) Old 07-25-2013, 01:18 PM Thread Starter
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Re: Wiring fog lights into my truck

actually i want to wire them up the easiest way i can so either with one relay or two. but i still want them to work like i said in my last reply. and remember my truck never had the option for fog lights in the early 90's.
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post #6 of 9 (permalink) Old 07-25-2013, 02:29 PM
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Re: Wiring fog lights into my truck

When I first looked at his drawing it looked wrong. But looking again he is using the headlight high beam as a ground path for the relay when the high beams are 'off'. Kind of an unorthodox way of doing it but it should work. Only because most relays have a low enough 'pull-in' voltage to still pull in even with the added resistance of the bulb which isn't much.

A different way to do it would be to put the on/off switch for the fog lights on the other relay coil lead and connect that lead to the low beam lamp lead and ground the other side of the relay coil.

Either method should work as long as there is a good connection to at least one high beam lamp. Lose the connection to both headlamps or both lamps burned out and the fog light relay would not pull-in.
R
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post #7 of 9 (permalink) Old 07-25-2013, 02:31 PM
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Re: Wiring fog lights into my truck

Then, to simplify - the diagram below shows everything you are adding to your truck, and where it connects. The fog lights will come on with your park lights or headlights. The fog lights will turn off when you use high-beam headlights. Does that make more sense?

David

Simplified fog light schematic with only added components - one relay, one fuse, and some wire:


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post #8 of 9 (permalink) Old 07-25-2013, 02:57 PM
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Re: Wiring fog lights into my truck

That will also work as long as you don't replace all the bulbs in the parking lamps with LED bulbs. Not likely you will but if you did the LED's may not pass enough current for the relay to pull in. Ask me how I know this.'
R
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post #9 of 9 (permalink) Old 07-25-2013, 04:31 PM
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Re: Wiring fog lights into my truck

Quote:
Originally Posted by Comechero65 View Post
That will also work as long as you don't replace all the bulbs in the parking lamps with LED bulbs. Not likely you will but if you did the LED's may not pass enough current for the relay to pull in. Ask me how I know this.'
R
Well, it's the same wiring Ford, Toyota, GM and others have used on their fog light circuits for years, so it's no different than any newer car or truck in that regard. They also ground through the headlights with no problems I've heard of. They also used this grounding trick with alternating turn and clearance lights - with no relays - for many years, so it's a solid system.

If he should ever want to use them, the clearance light LEDs should not cause any issues with this circuit, as the resistance for the LEDs is in the bulbs (at least ones made in the last several years), and would not affect the power available on the brown wires to energize the relay. Early LED "bulbs" did not have the built-in resistance and a primary resistor had to be used to limit power on all the clearance light wiring. That also meant you couldn't hook trailer wiring or anything extra to it. Is that the issue you had?

David

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