Homer Posted January 20, 2010 Share Posted January 20, 2010 Does anyone have a wiring diagram or can explain the simplest way to wire in one of the reverse lamps as a fog lamp? I couldn't find a guide in search. I understand how to chop in the wires, but what needs to go back to the dash switch and where does the live need to be taken in the dash? Also, does it need to be fused? Quote Link to comment Share on other sites More sharing options...
JustGav Posted January 20, 2010 Share Posted January 20, 2010 (edited) Yes, should always be fused, however if you use something like the radio feed it will have it's own fuse already. You will require a live and neutral to power the telltale light and then simply run 1 wire to the back where you have done the reverse light change. If you get stuck give me a buzz. EDIT : I used a dash feed, so that the fog light could only be turned on if the lights were on. Edited January 20, 2010 by JustGav (see edit history) Quote Link to comment Share on other sites More sharing options...
jazz1 Posted January 20, 2010 Share Posted January 20, 2010 good thread i need too re wire mine its all fitted but i changed the back looms and dot know which wire goes where:( Quote Link to comment Share on other sites More sharing options...
Homer Posted January 20, 2010 Author Share Posted January 20, 2010 Yes, should always be fused, however if you use something like the radio feed it will have it's own fuse already. You will require a live and neutral to power the telltale light and then simply run 1 wire to the back where you have done the reverse light change. If you get stuck give me a buzz. EDIT : I used a dash feed, so that the fog light could only be turned on if the lights were on. Thanks Gav. Where would you take the live from for the dash feed? I assume the dimmer switch is a good one since it's fused, linked to the lighting system and in an easy position. Would the wire running to the back be a live or neutral, does it matter? Quote Link to comment Share on other sites More sharing options...
JustGav Posted January 20, 2010 Share Posted January 20, 2010 Thanks Gav. Where would you take the live from for the dash feed? I assume the dimmer switch is a good one since it's fused, linked to the lighting system and in an easy position. Would the wire running to the back be a live or neutral, does it matter? Dimmer switch is an okay one, just make sure of the wattage load. The wire running to the back will be a live one. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 20, 2010 Author Share Posted January 20, 2010 Dimmer switch is an okay one, just make sure of the wattage load. The wire running to the back will be a live one. Thanks mate, will do. Will drop by Maplins in the week and see if they have the right bits. Quote Link to comment Share on other sites More sharing options...
JustGav Posted January 20, 2010 Share Posted January 20, 2010 (edited) http://www.maplin.co.uk/Module.aspx?ModuleNo=43005 Has 3 wires, v+ in, v+ out and gnd, nice and simple. Just checked with Gray as well and it should be good enough for an MOT EDIT : I would also of course take it PRE-dimmer, so the fog light doesn't go up and down with the dashlights and you don't put the additional load through the dimmer. Standard fog light is 21w, which is about 1.75A which is comfortably in the switch's range. Of course ideally you would want to put a relay between it to ensure you don't put any additional load on the existing loom. Edited January 20, 2010 by JustGav (see edit history) Quote Link to comment Share on other sites More sharing options...
Homer Posted January 20, 2010 Author Share Posted January 20, 2010 Gav, is this right? (Updated) Quote Link to comment Share on other sites More sharing options...
JustGav Posted January 20, 2010 Share Posted January 20, 2010 Gav, is this right? Yeah, very simplified, but that is right, what is a retarted battery though Quote Link to comment Share on other sites More sharing options...
Kev.O Posted January 20, 2010 Share Posted January 20, 2010 Love the retarded battery Quote Link to comment Share on other sites More sharing options...
Homer Posted January 20, 2010 Author Share Posted January 20, 2010 Yeah, very simplified, but that is right, what is a retarted battery though Did I miss anything in the wiring diag as that's what I hope to wire in? Retarded battery means I suck at even using MS Paint Quote Link to comment Share on other sites More sharing options...
JustGav Posted January 20, 2010 Share Posted January 20, 2010 Did I miss anything in the wiring diag as that's what I hope to wire in? Retarded battery means I suck at even using MS Paint Nope, it isn't any more complicated than that. Quote Link to comment Share on other sites More sharing options...
Homer Posted January 20, 2010 Author Share Posted January 20, 2010 Thanks mate, much appreciated Quote Link to comment Share on other sites More sharing options...
JustGav Posted January 20, 2010 Share Posted January 20, 2010 Thanks mate, much appreciated If you get stuck, I'll pop over and give you a hand. Quote Link to comment Share on other sites More sharing options...
trinitom Posted January 21, 2010 Share Posted January 21, 2010 mine is wired to the front fog lights, the rear fog light only work's when the front fog light's and separate switch are on. Quote Link to comment Share on other sites More sharing options...
jevansio Posted January 21, 2010 Share Posted January 21, 2010 I know gav posted a switch with an led in, but I thought I'd specifically mention to anyone else, the fog light switch must illuminate (or I guess illuminate a light on the dash) when on to pass an MOT Quote Link to comment Share on other sites More sharing options...
Homer Posted January 21, 2010 Author Share Posted January 21, 2010 I know gav posted a switch with an led in, but I thought I'd specifically mention to anyone else, the fog light switch must illuminate (or I guess illuminate a light on the dash) when on to pass an MOT 'tis true I'm going to try and use the UK fog lamp switch and the fog lamp light in the cluster (which is UK spec so has the bulb). Probably more hassle than it's worth but I like things tidy Quote Link to comment Share on other sites More sharing options...
JS2004 Posted February 23, 2010 Share Posted February 23, 2010 (edited) Homer, did you manage to get this working? I am in process (Dash is out and in bits.. wires everywhere) of trying to rewire my rear fog. It is currently chopped into the ash tray lighter but doesnt work with standard bulb (Works with LED bulb). However with standard bulb in, when I flip the switch for fogs I get nada lightwise - but I do get smoke which is never good.. and the ashtray light dims. I suspect this is because I switched it on whilst the main dash console and top warning lights are all not plugged in (assuming thats not smart also). However now I have all the dash out I want to wire it to the dimmer switch like you have in the hope it will work. Im a complete novice at this - could you list the bits (even if its wire, and the ampage etc) that you used, and which of the dimmer switch wires you chopped into please? Mines a Jspec n/a not sure if that changes anything. I need to get it sorted for MOT.. and obviously as I am not keen on the smoke generated (Came from behind the dash) when the fog light switch was turned on! Cheers! Added pics.. one shows current state of play. Other is the dimmer switch - hoping someone can label the wires. Edited February 23, 2010 by JS2004 (see edit history) Quote Link to comment Share on other sites More sharing options...
EdMorris Posted February 23, 2010 Share Posted February 23, 2010 'tis true I'm going to try and use the UK fog lamp switch and the fog lamp light in the cluster (which is UK spec so has the bulb). Probably more hassle than it's worth but I like things tidy I'll be doing this too. There is a write up on here but its quite complex (for me anyhow). Will be interested to see how you tackle it. Quote Link to comment Share on other sites More sharing options...
merckx Posted February 24, 2010 Share Posted February 24, 2010 Im a complete novice at this obviously as I am not keen on the smoke generated (Came from behind the dash) when the fog light switch was turned on! It's not easy to give the right advice to a complete novice like you say especially when you've had smoke coming from behind the dash. I'm sure it would be safer to get someone to do it for you as you've obviously overloaded a circuit which should be investigated, you don't want the car to go up in flames. Quote Link to comment Share on other sites More sharing options...
JS2004 Posted February 24, 2010 Share Posted February 24, 2010 Aye - I plan on getting out the Auto-motive spark tomorrow and asking him to wire it up from the stereo supply. The weird thing is the modification had been in there for a while, and was working and passed previous MOT (Previous owner). Its only once I started messing with it that everything went south - and I only did that because the switch wouldnt always light up. Would the little switch itself have a fuse in ? bah - damned thing lol Will leave it to the spark, and shell out some more cash. I hate electronics Quote Link to comment Share on other sites More sharing options...
merckx Posted February 24, 2010 Share Posted February 24, 2010 Would the little switch itself have a fuse in Very unlikely. Quote Link to comment Share on other sites More sharing options...
movistar Posted February 24, 2010 Share Posted February 24, 2010 Not being funny but dont you think you should use a relay? You need a 4 pin fused relay + a switch, take the power source from the switched live on the lights(fuse box) on the relay use pin87 to your rear lamp(positive), pin 85 to a commonm earth, pin 30 to Perm live (Batt), pin 86 to the switch. This will save you burning out the switch long term and gives a safe cuircit. Quote Link to comment Share on other sites More sharing options...
movistar Posted February 24, 2010 Share Posted February 24, 2010 Not being funny but dont you think you should use a relay? You need a 4 pin fused relay + a switch, take the power source from the switched live on the lights(fuse box) on the relay use pin87 to your rear lamp(positive), pin 85 to a commonm earth, pin 30 to Perm live (Batt), pin 86 to the switch. This will save you burning out the switch long term and gives a safe cuircit. Oops just read you are doing just the one...this is best when doing two, for the one make sure you use a 7-10 amp switch and forget the rest i said...always use a fuse though 10amp is ok.And using the switch live from the lighting cuircit. Quote Link to comment Share on other sites More sharing options...
Supradoopa Posted February 24, 2010 Share Posted February 24, 2010 I've got an image on my phone... Not sure if it helps or not Quote Link to comment Share on other sites More sharing options...
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