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Rough-In wiring for Fog-Lights

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Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
Printed Date: September 28, 2023 at 1:06 PM

Topic: Rough-In wiring for Fog-Lights

Posted By: vseth
Subject: Rough-In wiring for Fog-Lights
Date Posted: May 18, 2005 at 9:40 AM

I've hooked up my alarm/starter near my ignition harness. But before I close up all of the trim, I want to connect the lightling switch for my low-beam with some rough-in wiring for fog-lights ( which I have not bought as yet ). So here goes:

1) Do fog-light kits typically come with the relay connections, or should I rough-in the relay wiring underneath the steering now ? Or should I simply splice the lighting wire, and just route the lighting signal wire up near the headlights, for use later ?

2) If I connect the relay now, I'll have to route the fog-light power wire from beneath the steering all the way to the headlights. If I do this, I'm going to be taking +12v from my amp power wiring ? So for fog-light installation, are the power connections typically made at the headlights itself ? Also are the relay connections in the fog-light kits typically made at the headlight itself, or near the lighting switch ?

3) Should the fog-lights be connected to both low low-beam ( i.e. daytime running lights ) and high low-beam ?

With all the spider-mesh of wiring at the ignition and lighting harnesses after the alarm/starter install, don't think that I'd want to open that stuff again ?


Posted By: ff-mike
Date Posted: May 19, 2005 at 11:43 AM
1- They may or may not come with the wiring. The kits are usually cheesy that they come with. If it were my vehicle, I would tap the parking lamp wire under the dash for the lighting signal and route that to switch and into engine compartment

2- I tap the battery for main power for the lights

2- na

Posted By: geepherder
Date Posted: May 19, 2005 at 2:49 PM

Fog lights will usually come with some wiring, but no relays.  My suggestion to you is to find a knock out panel in your car where you wouldn't mind the switch mounted.  You may not like the switch that comes with them, so just find one that suits you.  If you use a simple toggle switch you'll only need two wires- one from your constant power source (fused), and one out to trigger your relay(s).  If you choose a lighted switch, you'll have three wires- constant, trigger, and ground.  It doesn't matter where you get your constant source for your switch since you'll only be using it to trigger your relay(s).

I used my own switch to trigger my fog lights, independent of the head lights.  To best utilize the power your relays provide, I'd mount them under the hood somewhere between the battery and the fog lights.  Power them off the battery, and run your trigger wire from your dash mounted switch.

For legality reasons here in the US, I have a relay wired in which cuts the ground to my fog lights when I turn on the high beams.

My ex once told me I have a perfect face for radio.

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