I remodeling my wiring harness (completely out of the car and adding and subtracting wires as needed) and will probably have a series of issues - but currently I'm working on adding wiring for a future set of extra fog lights (vintage rally style mounted to the front bumper on brackets). The car and harness are '72 and wiring is already there for the stock fogs. The extras will only be run occasionally and so I'd like to put them on a separate circuit.
I have the front half of a '74 harness that I'm stealing wires, etc from. So from it I've pulled the late fog light switch, stock wiring and the stock relay that they are attached to. My question is how to add and power the relay to the original '72 harness .. any how that then attaches to the fuse panel? Any help appreciated, thanks.
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I do not use "Fog" lights here in Hell.
You need them 2-3 times a year.
If I'm adding lights, they are "Driving" lights.
Put a pair of Hella Euro Drivers (not DOT legal) on a 240Z, ran them direct off of alternator feed through a Bosch relay. Flame throwers!
The customer said he couldn't really use them. He stated they lit up the road 1/2 mile away. Twice as far as the high beam which were "hot rodded" as well.
He was terrified of getting a ticket for them.
He does use them if there is no-one around.
If I was searching for a factory look and I did not have the rear window defroster, I’d use that circuit. That would be the forth relay socket on the relay board. It would use the same round relay. You’d want to check what amps are available on that circuit and how many amps the lights will draw. I would imagine that if the defroster was available on your year car that the wiring harness will have the wires for the switch leg in the cabin.
I also use the clear lenses (driving lights) on mountain roads. They have a wider pattern and allow you to see both sides of the road. Comes in handy for seeing critters in the bushes. I also rewired mine so I can also use them as daytime running lights without the headlights.
! didn't answer the original question.
It's easy to add a relay that gets its activation leg power from the original fog lights when on. the ground side of that can be wired into a hidden switch under dash.
This way the extra fogs will only activate when the original fogs are on and the microswitch has been triggered to ground.
The power for the lights themselves can come from an under-utilized fuse in the fuse box or direct from battery. If direct add an in-line fuse to this circuit.
The relay activation power can come from anywhere. The fog light circuit, another fuse that's hot with ignition on or direct from battery.
The fog light circuit means ONLY when orig fogs are on.
The hot in ign fuse is whenever the car is on. They can be used as daytime running lights like this.
Direct to battery is all times on and only turned off when the micro switch is open.
This will often lead to a dead battery if you forget to turn them off. I would not wire it this way, but it will work fine.
The rear defroster circuit might be an excellent choice. I'd have to looks at how that circuit runs in car. This circuit should have pretty good amperage delivery as it ran a heater.
If you use LED fogs the power requirement goes WAY down and wire size is less
important.
The relay will need .2 amps or less to trigger. Running the relay trigger power off of the original fog light feed will not affect the output of the lights.
Hope this helps.
Rick
I have some experience in this area:
I replaced the fog lights with Cibie Tango driving lights, but modified the wiring to the relay so they are only available on high beam; the outers (Cibie Iode 45 fogs) were done by adding an extra relay switched (and fused) circuit that allows them to only run when headlights are dipped beam. In this way you get a choice of lighting setups but never overload the alternator.
I made up my own loom and wiring (for the added lights) to run alongside the existing harness, much as you are planning to do by modifying an extra factory harness. Feel free to PM me if you are struggling with wiring / relays / fusing.
- Tony
LEDs in all the front facing lights. Fogs, Frogs, headlights
If you are going fast, you need a lot of light. I think that you can never have too much. In a turn you want to see where you are going
Bob B this is in #41
Yeah make sure you are doing LED conversions for all the forward facing lights. Incandescent and halogen lights draw a lot of power from our already anemic alternators.
Zach
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