Thanks for that. Do you have two fog lights or just one? Presumably it doesn't actually matter what the light is, it's just that the wire gets there... Of course an independent switch would be necessary, which would explain why mine is like that... Will go out later to fiddle.
MOT requirements - lights??
- Thread starter JJKM
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My S3 had fog lights and hazards from new. Centre panel in dash with switch's for both and a brake fail warning light. Only fitted with one fog light and no reverse. Autosparcs rear loom came with two fog light cables, one for each side.
TheMegaMan
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You seem to have a lot of brown wires... Brown is supposed to be unfused 12V supply, so I'm guessing whoever put those wires in, just had a job lot of brown that they wanted to use up!
TheMegaMan
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And probably not useful to you, but my new autosparcs loom does have a green/brown wire for the reversing lamp, as well as red/yellow for fog lights. Those do seem to be the colours used.
TheMegaMan
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The reverse light (and fog light) was a retro-fit on mine, so the old wiring had an owner-added wire running outside the main loom, from the back to a switch on the gearbox. I don't recall the colour of the wire that fed the 12v supply to the other side of the switch, but I'll see if I can remind myself.
The new loom as the green/brown wire come out on a connector block in the engine bay, close to the main multi-way connector block (near the steering box). This other connector block has the wires for the fog lamp and heated rear window wiring, too, so it's clearly the additional wiring that was added over and above the basic lighting. I don't honestly recall whether I chose the reverse and/or fog light wiring as an option when ordering the loom, but I did think I'd need to be running a few more wires down to the back, so it's very pleasing that I didn't actually have to, although I do still need to run the wires to the reversing light switch on the gearbox, as I wasn't intending to add a manual switch for that (although I can see it might actually be useful to have that).
The new loom as the green/brown wire come out on a connector block in the engine bay, close to the main multi-way connector block (near the steering box). This other connector block has the wires for the fog lamp and heated rear window wiring, too, so it's clearly the additional wiring that was added over and above the basic lighting. I don't honestly recall whether I chose the reverse and/or fog light wiring as an option when ordering the loom, but I did think I'd need to be running a few more wires down to the back, so it's very pleasing that I didn't actually have to, although I do still need to run the wires to the reversing light switch on the gearbox, as I wasn't intending to add a manual switch for that (although I can see it might actually be useful to have that).
TheMegaMan
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Looks like it was a green wire. That makes sense, as green is 'accessories, fused via ignition switch'.
Hmm... okay. I have traced the wire to the loom at the engine bay. It returns to being green and brown, then goes into the cab in the main loom but then disappears!! I have spare red and yellow ones (don't appear to do anything), a brown and red (is attached to an earth?) And two blue and white ones. Still cannot find any trace of the damn reverse wire. Have most of the dash hanging out now...
TheMegaMan
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I feel your pain. My wiring was a real birds nest, which is why I decided to go with a brand new loom and start again on my rebuild.
Blue/white is a headlight cable, I think. I recall my fog light switch uses the headlight feed as a supply to ensure the fog light only works when dipped beam is on, but I think that's blue/red. I think blue/white is main beam...just goes to the stalk switch, as I recall (plus to the headlights, of course).
Blue/white is a headlight cable, I think. I recall my fog light switch uses the headlight feed as a supply to ensure the fog light only works when dipped beam is on, but I think that's blue/red. I think blue/white is main beam...just goes to the stalk switch, as I recall (plus to the headlights, of course).
You might find one is for the main beam warning lamp.
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Firstly use this to check the legality of evrything with regard to the year of your vehicle.
https://www.gov.uk/guidance/mot-ins...ivate-passenger-and-light-commercial-vehicles
From memory I would think neither of these were required in 1983.
And both can be fixed to the rear switched manually as long as you include a warning light on the dash.
If you want to disconnect them, you could just disconnect and insulate the wires from the backs of the switches.
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legally they should have gone on only with main beam and gone off when you reverted to dipped beam, which is why most are fed from the main beam feed near the headlights, and switched maybe through the neg wire? Though not necessarily.
On a series they should be powered by a relay and that is switced by the main beam circuit, the standard wiring and stalk wont last long with an extra 150 or 200 watts through it, which could be why they were on a seperate switch
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Absolutely re relay. no switch would last long without one, my comment was more to do with the need to have them only come on under two conditions,
a/ Main beams ONLY on
b/ special spotlight switch on.
Here is a tutorial including wiring diagram, which shows how to wire in the relay.
https://www.4x4community.co.za/forum/showthread.php/8006-Wiring-of-spotlights
There are tons of articles on tinternet but a lot don't mention doing it fully legally for the UK, i.e. to only come on in tandem with the High beam, so they can be confusing.
Best of luck
If you use a three way (on/off/on) you can have both scenarios on the same switch. One feed from a 12v source and one feed from the main beam source and the output to your relay.
