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Jun 14th, 2026
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Joined: May 2016
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Just Getting Started
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OP
Just Getting Started
Joined: May 2016
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I have a 2018 Roadster. Is there wiring in place for front fog lights? How can I locate it? Same question about the switch that would be in the dash
Thanks
Ed
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Joined: Feb 2016
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Needs to Get Out More!
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Needs to Get Out More!
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There is a wire in place for the front fog lights coded blue/yellow (U=blue) for the switched positive feed. The wire is tucked out of the way inside front of right hand wheel arch. As can be seen on wiring diagram below the feed is from the BCU as they only work with headlight, and on command from the front fog light switch so this would need to be added to the dash. I believe dash wiring will be in place for this as well. 
Last edited by Richard Wood; 22/01/19 11:01 PM.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Jul 2007
Posts: 27,809 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
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Richard,
does the same apply for a 2006 Roadster?
John
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Feb 2016
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Needs to Get Out More!
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Needs to Get Out More!
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Possibly not John. The info is from the 2014-on Classics parts manual and my own experience on a 2018 Roadster.
It would be easy to search for the redundant wire inside the offside wheel arch though.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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Joined: Nov 2015
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Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
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Richard,
does the same apply for a 2006 Roadster?
John John (Richard hope you don't mind me answering) your harness would be the same as my previous S1, unfortunately not pre-wired for fogs or spots, I took a feed off the high beam to trigger a relay to operate my spots The latest Roadsters are way more complex on wiring and use a BCU (body control unit) to feed power to the ancillaries as Richard describes
Jon M
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Member of the Inner Circle
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Cheers guys. I'll have a look when back from S Africa at the weekend.
I have the Simmonds brackets & keep wondering about fitting some.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Joined: Nov 2015
Posts: 8,671 Likes: 489
Just barreling along Needs to Get Out More!
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Just barreling along Needs to Get Out More!
Joined: Nov 2015
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John, just checked my old S1 wiring diagram and as suspected there are no fuses or cables marked up as Aux lights
I used the 30amp Aircon feed to the 8 way bulkhead fusebox (as I had no aircon) mounted a relay below & took the 'trigger' wire off high beam, worked well
Andy MOT, may be able to confirm but my MOT chap said if linked to hi-beam, the spot lamps did not need testing for aim, if on a separate switch they did (as the driver could leave them on)
Jon M
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Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
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On my 2005 there's a rats nest of wires next to the front wing stay and the blue/yellow ends in a two pin connector.
It's worth inspecting those connections anyway because the wingtop lights,sidelight, headlight (offside) and horn are all there. Later cars also have the speedo sensor wires there.
I've had some dodgy connections there over time. Some are bullet connectors.
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Joined: May 2016
Posts: 51
Just Getting Started
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OP
Just Getting Started
Joined: May 2016
Posts: 51 |
Richard
i have located a clearer wiring diagram.
thanks for your help!
Ed
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Joined: Jul 2007
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Member of the Inner Circle
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Member of the Inner Circle
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Posts: 27,809 Likes: 749 |
Thanks guys, a project me thinks for when I have time
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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