Guest Posted June 15, 2014 Share Posted June 15, 2014 I disconnected the LED rear brake light and went for a drive (~25 miles). Initially the speedo behaved but as the car warmed up I had the usual flicking when indicating and dropping to zero when braking. At higher speeds the flicking was maybe 2 mph of movement, at lower speeds the flicking would be ~10mph of movement. Likewise with dropping to zero when braking, more noticeable and quicker when going slow. I had a check of the earth connections again and I can't see how they could be any cleaner or better. I think it is a case of trying a different speedo. Link to comment Share on other sites More sharing options...
John Vine Posted June 15, 2014 Share Posted June 15, 2014 Quoting AndrewB: I went for a blat this morning over towards Rivington. On the way their I experienced light drizzle. The wipers worked for a dozen times or so then on the next flick of the switch the fuse popped. Is this likely to be related to the speedo still not working (Works okish for ~13 miles, flicks with indicators, dies with brakes), or is it just a bit of coincidence? When I got back and checked the wiring diagram I saw a note that the brake lights needed a resistor. The note said something like A) Half Mated with 68 ohm (or something) resister. Could it be I am missing the resistor? Where would it be. Having added an LED brake light should I have put a resistor in that leg? The brake lights do work and seem bright. Any thoughts appreciated.Hi Andrew -- I'm no autoelectrician, but looking at my wiring diagram, I think the resistors you mention are part of the speedo and tacho set-up. I don't think they have any bearing on the rear lights. JV Link to comment Share on other sites More sharing options...
John Vine Posted June 15, 2014 Share Posted June 15, 2014 Quoting AndrewB: I think it is a case of trying a different speedo.I agree. Good luck! JV Link to comment Share on other sites More sharing options...
Guest Posted June 22, 2014 Share Posted June 22, 2014 FIXED James at Caterham sent me a fix to try which involved cutting the earth cable from the sensor plug and making a new earth connection to the chassis locally to the sender plug. I did this on friday and after nearly 350 miles over two days I can confirm it has worked a treat. No more dropping out, the distance to my mums was spot on and no more blown fuses. It worked for me but I suggest you speak to Caterham if you have a similar issue as it may or may not be the fix you need. More detail and pictures on the blog. here Link to comment Share on other sites More sharing options...
John Vine Posted June 25, 2014 Share Posted June 25, 2014 That's great news, Andrew. And, well done, James at CC. The thing that's now puzzling me is that, although a new speedo fixed my problem (with identical symptoms to yours), it did so using the original sensor wiring. JV Link to comment Share on other sites More sharing options...
Leadership Team Garry7 Posted August 4, 2014 Author Leadership Team Share Posted August 4, 2014 Update: Having had the new sensor on for couple of weeks the speedo started to fluctuate wildly again with occasional drops to zero - failed to record mileage during the fluctuating phase. It went into CC for the mod (as described by Andrew above) this morning - so far the signs are good - rock steady needle that is with 3-5 mph of the satnav. Will report back when it's got a few more miles under its belt. Link to comment Share on other sites More sharing options...
John Vine Posted August 4, 2014 Share Posted August 4, 2014 Quoting Garry7: Update: Having had the new sensor on for couple of weeks the speedo started to fluctuate wildly again with occasional drops to zero - failed to record mileage during the fluctuating phase. It went into CC for the mod (as described by Andrew above) this morning - so far the signs are good - rock steady needle that is with 3-5 mph of the satnav. Will report back when it's got a few more miles under its belt. Good news. If you're looking for a little gentle w/e activity, it's possible to achieve a high degree of speedo accuracy (especially the trip) by tweaking the 6-digit programming code. JV Link to comment Share on other sites More sharing options...
makingff Posted August 5, 2014 Share Posted August 5, 2014 Quoting Garry7: Update: Having had the new sensor on for couple of weeks the speedo started to fluctuate wildly again with occasional drops to zero - failed to record mileage during the fluctuating phase. It went into CC for the mod (as described by Andrew above) this morning - so far the signs are good - rock steady needle that is with 3-5 mph of the satnav. Will report back when it's got a few more miles under its belt. Garry, can you BM me details of what you did as this is next on my list of things to tackle. Thanks. Link to comment Share on other sites More sharing options...
Guest Posted August 5, 2014 Share Posted August 5, 2014 +1 And me too... Link to comment Share on other sites More sharing options...
John Vine Posted August 5, 2014 Share Posted August 5, 2014 Quoting makingff: Garry, can you BM me details of what you did as this is next on my list of things to tackle.I think what you need is the earthing mod described by Andrew . JV Link to comment Share on other sites More sharing options...
makingff Posted August 5, 2014 Share Posted August 5, 2014 Perfect! *thumbup* This should link to the exact post here. Link to comment Share on other sites More sharing options...
Leadership Team Garry7 Posted August 5, 2014 Author Leadership Team Share Posted August 5, 2014 I cheated and made CC fix it 😬 It's subject of a workshop update (CC for a recall if pushed!) so I asked them to do it. James did e mail me the update notice, if you BM me an email address I'll send it to you. Garry Link to comment Share on other sites More sharing options...
makingff Posted August 5, 2014 Share Posted August 5, 2014 Garry, you have BM! Link to comment Share on other sites More sharing options...
Guest Posted August 6, 2014 Share Posted August 6, 2014 +1 and a BM from me Link to comment Share on other sites More sharing options...
John Vine Posted August 6, 2014 Share Posted August 6, 2014 BM from me too. JV Link to comment Share on other sites More sharing options...
makingff Posted August 9, 2014 Share Posted August 9, 2014 Did the mod this afternoon (took a bit longer than the CC guys probably do it in) and early indications are that it's fixed!! Thanks for the email Garry, that helped a lot. Link to comment Share on other sites More sharing options...
pugwash Posted August 9, 2014 Share Posted August 9, 2014 Garry, You have BM from me. My speedo has been showing early signs of what you describe. Speedo seems to work fine but with a wobble on the needle every now and then. However I did 30 miles less according to my 7 on the run down to Le Mans, compared to the guys I was travelling with. Mark Link to comment Share on other sites More sharing options...
makingff Posted August 9, 2014 Share Posted August 9, 2014 Mark The mileage was a problem for me too. If you BM me your email address I can forward Garry's email. Link to comment Share on other sites More sharing options...
PL15 Lowflyer Posted August 10, 2014 Share Posted August 10, 2014 Hi Garry, Email sent re speedo fix. Regards, R. Link to comment Share on other sites More sharing options...
Leadership Team Garry7 Posted August 11, 2014 Author Leadership Team Share Posted August 11, 2014 Hopefully everyone that asked for a copy now has it (if not, let me know). Gave mine a proper test on Saturday, including a "spirited" run with a Bentley and a 911, at last, the needle stayed steady throughout, even a higher speed. Hoping this is the fix to a problem that's been annoying me for ages and spoiling the enjoyment of the car. Link to comment Share on other sites More sharing options...
pugwash Posted August 11, 2014 Share Posted August 11, 2014 Thanks Garry, Mail received. Regards, Mark. Link to comment Share on other sites More sharing options...
Ben Fung Posted August 11, 2014 Share Posted August 11, 2014 Hi Garry - YHBM and fingers crossed that this finally resolves my speedo woes too! Link to comment Share on other sites More sharing options...
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