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Thanks Doug. I had considered the heated rear widow switch but no spare terminal there although I could make something up. I agree about the difficulty of access to the stabiliser although once connected I would hope I would not need to go there again.....! I will have a further think.

If the dash is out ( as mine is) I think the simplest is to take the live for the voltmeter from the spare terminal on B side of voltage stabiliser - unless that would be a problem?

Thanks for all the advice - which did not get the problem sorted! I have been using the car without any problems for about 2 years and thought I should advise the problem in case others had similar issues. I swapped distributors after discovering a lot of vertical play in the shaft. This sorted it and then I got the original one rebuilt through the club shop and swapped them back again. I can only think that it was settling when cold and allowed the car to start and run perfecty and then by some quirk always moved when it was switched off, left for about 1/2 an hour and restarted. The shaft then dropped down and lost conact with the distributor cap. I wasn't clear exactly how this was happening and have left it for quite some time to make sure fault has not reappeared - it hasn't.

Yes I get a good spark even when it has died, hence my thinking it is not electrical. I leave it until it is cold normally because i have had to abandon it somewhere - then it starts immediately. It is one of best starting cars I have had in that it fires first time. Only thing I do if not run for several weeks is tickle the pump but normally I do not need to do that if it is just say a week.

Thanks Pete. Got to MOT and back which is first time in 3 MOTs. I am sure (as I can be) problem is not electrical as Colourtune always shows big fat spark even when she will not start. I think next step is to purge fuel line and replace rubber hoses in wheel arch and at carbs although all seems to be completely clean.

Still no wiser having stripped everything down as suggested- fuel good and spark - MOT tomorrow so the test will be whether I get there and back. Thanks again

Thanks for the quick replies gents! I did a reply and it has disappeared somehow so this may appear twice but not exactly the same. Yes they are Strombergs. I get it MOT'd at the local Vauxhall dealer as they have a former Triumph apprentice as one of their senior guys and he has MOT'd it for years. They only charge £30 and I discussed the problem with him and he said he would love to have a go so I thought why not and it behaved itself ( the ony time in over a year of course!) and after an hour he said he could find nothing wrong and commented on how well the carbs were set up etc - he still has the tools. No charge from them for this as they found no fault. I wondered about the tank not venting so my 35 min run today was with the flap open. Also tried different sets of HT leads, condensers, dizzy caps, points but not the coil yet as the only one I have spare is a a 6V with ballast resistor. All wires checked following your posts and are tight and correct polarity. Fuel flow from pump is excellent so I had discounted probs before carbs but will check as you suggest tomorrow - also the carbs. All were serviced by me and new fuel lines throughout as part of a full rebuild about 3 - 4 years ago. Once again many thanks and will advise how I get on tomorrow. Hugh

I am new to this although I have been a member of over 20 years. I have an unmodified GT6 MK3 (owned for over 23 years) which for over a year runs for about 20 minutes on the road and then just stops whatever the weather or time of year. When this happens there is no sign of interest as she turns over on the starter motor. Today in the really hot weather she started first time ( as always) and I left it on tick over and it ran for 35 minutes whilst I sat beside it and listened. Temp gauge fluctuates as the thermostat opens and closes and she is not overheating. It did not misfire but again just stopped. I had a Gunsons Colour tune plug ready and whipped it in to see a nice big fat spark on turning over so my original thoughts on an electrical problem seemed to be wrong. I removed pump to carbs pipe and turned over again and good healthy pumping of fuel. I removed both drain plugs from bottom of carbs and both were full of nice clean fuel so I am at a loss. I know she will start first time when cold later on - any ideas please?