 | Home > Technical > Fog Light Relay Operation |
 
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324  
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Hello folks,
Does anybody know how the standard fog light relay works? What the four pins are connected to? It's clearly some sort of latching relay and I have half an idea to re-purpose one.  Click image to enlarge Despite all of the various numbers on it, the LR part no. is YWC104430. Thanks for looking. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia Last edited by LandRoverAnorak on 20th Apr 2020 7:48pm. Edited 1 time in total |
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13th Aug 2018 8:36pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Ah, fantastic! That is just what I need.
That's another little project lined up, then. Many thanks. Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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13th Aug 2018 9:54pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6092 
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I'm considering one of these for my heated screen wiring... my timer unit has gone duff (about 6 yers ago!) and getting one (a proper LR one) is quite costly... and I've got a spare fog light unit in the garage...
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14th Aug 2018 5:56am |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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Me too. Bought on a whim as I knew it was a latching relay but didn't know how it was connected. Now though, I can use it to solve a problem described in my build thread. There I've used a different relay that's turned out to be too sensitive to be used reliably with standard LR buttons. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia Last edited by LandRoverAnorak on 14th Aug 2018 8:14am. Edited 1 time in total |
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14th Aug 2018 6:13am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17367 
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Other, non-LR , options are available, for example https://www.12voltplanet.co.uk/adjustable-...v-10a.html Still not cheap though. |
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14th Aug 2018 8:06am |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720 
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The front screen timer is originally from an Range Rover classic, so you can probably find a second hand one. Personally I'd go the original route rather than a bodge which will slightly devalue the car. For anyone now reading this thinking they'll buy a fog lamp unit instead of a screen timer.... PRC6796 Front screen timer is £57, YWC104430L rear fog lamp relay is still £45 If you don't have one sitting in the garage is it worth the hassle for the sake of £12? |
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14th Aug 2018 10:39am |
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| sloderby1 Member Since: 08 Feb 2018 Location: Derby Posts: 20 |
Be careful of the current you're trying to switch.
The fog lamp relay is designed for 2 or 3 bulbs of 21W + indication at 1.4W so in the order of 5 Amps max. This is confirmed by the design information for this device which states that it should be protected by a 7.5A fuse. Internally the PCB tracks will be destroyed if the load is too great. |
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14th Aug 2018 4:52pm |
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| PaulMc Member Since: 17 Jan 2009 Location: Kent Posts: 501 
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sloderby1 - Do you work at Pektron
 Paul.
1989 Arles Blue 2.5TD 110 Hardtop 1999 Epsom Green Discovery II 4.0 V8i 'XS' |
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14th Aug 2018 5:01pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2414  
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Dumb question
Why this thing is called ECU-one touch fog lamp? Do all Puma Defenders come with it? Click image to enlarge Puma 110" SW ............................................................. Earth first. Other planets later |
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19th Aug 2022 1:10pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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It's an electronic box of tricks that controls the fog light and yes, all Pumas (and '02 onwards TD5's) come with it. Darren
110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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19th Aug 2022 2:29pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6605 
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It turns a momentary ground signal from the fog push switch on 2002MY+ Defenders into a latched fog light output. The supply is from the headlight feed, so fogs only come on with headlights.
It basically stops the fog light being left on when the Defender is switched off and back on again. Previous Defenders had a latching toggle switch on the steering column, and it can of course be left 'on'. 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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19th Aug 2022 3:09pm |
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| macfrank Member Since: 05 Nov 2015 Location: somewhere in the north Posts: 1073  
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When I first saw it I laughed at the term ‚ECU‘. Yes it‘s an Electronic Unit and it Controls something, but it‘s so simple, in modern card it‘s ‚one line of code‘ in the body/comfort ECU 🙃
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19th Aug 2022 3:55pm |
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