JS2004 Posted February 24, 2010 Share Posted February 24, 2010 I have now got mine fixed - took it to an auto-electrician and now all works! What he has done seems fairly simple but effective - at least enough to get through MOT. I have switch in dash, which is earthed to one of the screws on the auto-shifter that screws into the chassis. The live feed that runs to the back of the car is wired into the reverse light wit red bulb. The live feed for the switch itself comes from the rear, he has run a wire off one of the reverse lights into an inline fuse, which then travels to the front of the car and into the switch. 7.5amp Fuse used for this line. Result = Sidelights on + rear fog light switch - happy MOT tester! Maybe not the most ideal solution as I now have a red and a black wire running from front to back / back to front but it works and seems easy enough. I can provide pictures of mine now if anyone else wants to sort theirs out this way. Quote Link to comment Share on other sites More sharing options...
Thomas_germany Posted February 25, 2010 Share Posted February 25, 2010 We already had a thread about this. Supradoopra's solution needs two relais. Here's my solution without relais - hope it helps http://www.mkivsupra.net/vbb/showthread.php?t=173707 Quote Link to comment Share on other sites More sharing options...
MarkR Posted February 25, 2010 Share Posted February 25, 2010 Did you not fancy this? http://www.mkivsupra.net/vbb/showthread.php?t=80479 Quote Link to comment Share on other sites More sharing options...
Supradoopa Posted February 25, 2010 Share Posted February 25, 2010 Ahh so that's where I got it Quote Link to comment Share on other sites More sharing options...
Homer Posted March 17, 2010 Author Share Posted March 17, 2010 Would this work? Quote Link to comment Share on other sites More sharing options...
JustGav Posted March 17, 2010 Share Posted March 17, 2010 I did that, and then used rednail polish on the bulb Not pretty but it got through the MOT Although I used a +12v and not earth switched, No reason it shouldn't work really. Quote Link to comment Share on other sites More sharing options...
Homer Posted March 17, 2010 Author Share Posted March 17, 2010 Cool, so long as it works and is safe that's good enough, I just felt more comfortable doing it this way (simpler = less chance of something going wrong!). I have a couple of red bulbs so will use one of those, I don't keep any nail polish in the house Is the wattage for the fog lamp blub the same as the brake light? Quote Link to comment Share on other sites More sharing options...
JustGav Posted March 17, 2010 Share Posted March 17, 2010 21w I think (Don't quote me on that) Quote Link to comment Share on other sites More sharing options...
JS2004 Posted March 17, 2010 Share Posted March 17, 2010 21 W is for the fog light bulb yes. Are you taking the feed off of the rear lights that are on when the sidelights & above are on? Mines rigged up that way - I took it to an autospark. Not sure what wire was used though (does it matter.. looks like the type I wired up my facelift indicators with). From what I can tell I have a live from the rear lights running down side of car to the dash, into switch, then feed from switch to the reverse light. Edit - got an inline switch in there too from the live wire running from rear light to switch. Quote Link to comment Share on other sites More sharing options...
Homer Posted March 17, 2010 Author Share Posted March 17, 2010 I was planning to put the switch it on the -ve as (in my mind!) that would not require a 2nd wire to go back to the rear, it could just be earthed down by the dash. Would that work? Also the only lit switch I could find has 3 points on it (see pic), Can it still be used and if so, how do I wire it in? Sorry for the dumb questions, I can't get my head round this..! Quote Link to comment Share on other sites More sharing options...
JS2004 Posted March 17, 2010 Share Posted March 17, 2010 From what I can figure out you need the three prongs. One is the earth, one is the live in to the switch then the other is to allow the switch to send the power back to the light? Im not sure about the single -ve wire thing but from looking at what the guy did onmine I have two wires going to the back and one stays in the front as the earth. Might be wrong.. but mine has three prongs just like that. The earth used in mine goes from switch (should be labelled) to one of the screws that holds the autobox shifter to the chassis. Quote Link to comment Share on other sites More sharing options...
Homer Posted March 17, 2010 Author Share Posted March 17, 2010 Thanks mate, think I'll just do it the way your one is then Quote Link to comment Share on other sites More sharing options...
JustGav Posted March 17, 2010 Share Posted March 17, 2010 I can pop over after work one day if you want.... Quote Link to comment Share on other sites More sharing options...
Homer Posted March 18, 2010 Author Share Posted March 18, 2010 I'm having problems with this.. It's wired in and I can get the fog light to switch on, BUT the light on the switch doesn't light up. If I change the connections around I can get the light on the switch to light, but the fog light doesn't turn on. What have I done wrong! See diagram. connecting 1->3 2->4 5 blank OR earthed = fog light lit, not switch light 1->4 2->5 3 blank OR earther = fog light not lit, switch light lit No combinations get them both to light! Quote Link to comment Share on other sites More sharing options...
JS2004 Posted March 18, 2010 Share Posted March 18, 2010 Have you used both 3 and 5 as earths? or is that a typo? What happens if you have 1->4 2->3 5-> earth? Are there any markings on the side of the switch? Quote Link to comment Share on other sites More sharing options...
JS2004 Posted March 18, 2010 Share Posted March 18, 2010 From the looks of the other similar switches on maplin the middle connector should go to the thing your trying to power, and one of the outers is the power in, with other outer being earth.. http://www.maplin.co.uk/Module.aspx?moduleno=42949 http://www.maplin.co.uk/Module.aspx?ModuleNo=43005 one of the qustions about the switch too "Q- Connecting the ''Power'' tag to +12V and the ''VCC'' to the load does not let the LED light up when the switch is ON (although the load does operate). Does the ''Ground'' tag need to be earthed for the LED to work? - Richard M Answer- Yes the ground does need to be connected. " Sure the Earth is good? Quote Link to comment Share on other sites More sharing options...
Homer Posted March 18, 2010 Author Share Posted March 18, 2010 Thanks mate, very useful! Never realised the Maplins catelogue had such detail, this is the one I have: http://www.maplin.co.uk/Module.aspx?ModuleNo=218983 It says the same as what you'd posted and this was how I had wired it up... It could just be a bad earth, I'll give it another go tomorrow Quote Link to comment Share on other sites More sharing options...
JS2004 Posted March 18, 2010 Share Posted March 18, 2010 Aye from the Q&A part Quote: "Q- How are the terminals connected? Are 1 and 2 the switch terminals, and 3 the second connection for the illumination? - Dave Taylor Answer- 1 is live in 2 is live out 3 is ground. " if theres numbers on it rig it up that way - it sounds like its the earth not allowing the LED to light up. Im off round to Iceman`s tomorrow to help rig his up, no doubt we will encounter similar obstacles Quote Link to comment Share on other sites More sharing options...
JS2004 Posted March 19, 2010 Share Posted March 19, 2010 How did you get on with this Homer? Myself and Iceman sorted his rear fog light today, all works (though we did need more wire which we havnt got yet). Couldnt believe 3m of wire wasnt enough! Used one of those LED switches and spliced into the rear driving light wire to pull the 12v feed to the switch, then cut the reverse light wire and connected that to the switch. Earthed it and it worked. On the switch we used the middle prong was the wire to connect to the fog light itself and is controlled by the switch. The golden coloured prong on the side was the earth and the normal coloured prong on the other side was the 12v in. We used a 7.5 amp inline fuse in a fuseholder rated to 15amp. Went a bit ott with the earth wire though - managed to buy the kind you use in houses to earth 240v switches! Quote Link to comment Share on other sites More sharing options...
Homer Posted March 19, 2010 Author Share Posted March 19, 2010 How did you get on with this Homer? It was a bad earth All sorted now, thanks a lot for the advice I'll also add in a 7.5 amp fuse over the weekend, it shouldn't really be needed but best to be safe. Quote Link to comment Share on other sites More sharing options...
JS2004 Posted March 19, 2010 Share Posted March 19, 2010 Awesome. Yeah definately best to be safe with the fuse bit. All this messing around for a light that will hardly ever get used Quote Link to comment Share on other sites More sharing options...
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