Gridgway Posted May 15, 2023 Share Posted May 15, 2023 I successful wired up the wires I had split to take the wings off - bullet connectors - yuk. And after a small false start that all works.However my fog lights don't work. The bulbs are good, the earths from the bulb fittings are good. Then I tracked it all through to the switch, then to the side of the fuse that feeds the switch, all good. Fuse ok. However the other side of the fuse doesn't have12v.I made a slightly dodgy bodgy fuse that just has two wires, one soldered to the top of each fuse "leg". That's how I traced continuity all the way through to the bulb.Now I'm stuck. I don't know where the main 12v for the fog lights comes in. It looks to me that the next step is to get the fuse box off and poke around the back of it, but that feels pretty horrible.So all thoughts welcome from anyone who has knowledge here! Link to comment Share on other sites More sharing options...
Gridgway Posted May 15, 2023 Author Share Posted May 15, 2023 And also to add. I don't know when the fogs last worked. I've not checked them before. The car came with an MoT from two owners ago. Not sure if a foglight is mandatory for that age of car - I think so, so it's fair to think that they must have worked then. Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 15, 2023 Share Posted May 15, 2023 If you'd like the wiring diagram, the fuse layout and the "standard" wiring colours please send me a Private Message with your email address.Jonathan Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 15, 2023 Share Posted May 15, 2023 Have you tested the fog light with the dipped headlamps ON?Jonathan Link to comment Share on other sites More sharing options...
Gridgway Posted May 15, 2023 Author Share Posted May 15, 2023 Thanks Jonathan, I do indeed have all the diagrams.I #think# I tested them with side and then side and headlights on (and none). But that was an hour or two ago. Do you think the headlights need to be on for the fogs to work? It makes sense for it to be something that simple! Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 15, 2023 Share Posted May 15, 2023 Not just headlamps ON but dipped headlamps ON... Jonathan Link to comment Share on other sites More sharing options...
Gridgway Posted May 15, 2023 Author Share Posted May 15, 2023 You are a genius! I was sure they shoudl work independent of the headlights, but I was wrong and I clearly didn't test that!As you were everyone, nothing to see here!Now if someone could tell me why my reversing lights don't work that would be fab! They didn't work before and I had to change the switch on the gearbox and rewire that end. They still don't work! Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 15, 2023 Share Posted May 15, 2023 Now we need just one more on the fog lamps...https://www.caterhamlotus7.club/forum/techtalk/rear-fog-light-2: - )Jonathan Link to comment Share on other sites More sharing options...
JP Posted May 15, 2023 Share Posted May 15, 2023 I think April 1980 is the date when fog lights became mandatory - but if it is fitted to an earlier car then it has to work. This sticks in my mind from when my 1979 ex-coastguard Land Rover (with all the extra lights fitted) failed an MOT because one fog light lens had a crack in it... Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 15, 2023 Share Posted May 15, 2023 Reversing lights: The circuit is usually earth switched.It sounds as if you have a multimeter...How many terminals are there on the switch in the gearbox?What colours are the connected wires?Have you swapped any lamps for LEDs?Are you testing with the ignition ON?Jonathan Link to comment Share on other sites More sharing options...
Gridgway Posted May 15, 2023 Author Share Posted May 15, 2023 The reversing lights are tomorrow evening's job. I need to remind myself how they are wired. I think... two connections to the lights. So I think +ve to the lights, -ve back to one terminal on the switch on the box and the other terminal to the body. Starting point is to test the +ve to the lamps.Perhaps that needs the headlights on as well! That would make life easier to solve it the same way! Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 15, 2023 Share Posted May 15, 2023 : - )Probably needs ignition ON, but not any other lights.Jonathan Link to comment Share on other sites More sharing options...
Wrightpayne Posted May 15, 2023 Share Posted May 15, 2023 Early reverse switches had one connector and earthed through the body of the switch. Later switches had two connectors one of which needs earthing (doesnt matter which)As Jonathan states the switch connects to earth so you should have 12v at the lamp and switch (if the bulb is sound)Ian Link to comment Share on other sites More sharing options...
Gridgway Posted May 16, 2023 Author Share Posted May 16, 2023 Thanks Ian.The old reversing light switch was one contact, but didn't work. The new one I put in has two connections so I made up a lead to go to earth. The switch worked with the engine and box out so I hope it still does as I don't want to take it all out again to change the switch! I'm sure that's not going to be necessary though.I thought I'd have another go this evening, but I've had to go out to a "do" I'd forgotten about so it'll have to wait. Link to comment Share on other sites More sharing options...
Gridgway Posted May 18, 2023 Author Share Posted May 18, 2023 So without any changes, just faffing about a bit, one of the reversong lights works. It's the lhs one which is further forward in the wiring circuit if that makes sense. So the fault on the RHS is downstream of that. Most likely thing is just the rhs bulb. So I'll have another look tomorrow.With the lighting sorted, there is very little to do to get it ready for the rolling road for tuning. Not long now! Link to comment Share on other sites More sharing options...
Jonathan Kay Posted May 18, 2023 Share Posted May 18, 2023 Thanks for the update. Jonathan Link to comment Share on other sites More sharing options...
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