Update ...
as so often with an old car, I *thought* I had found the reason for unstable ignition, but Roy
pointed out that there shouldn't be any direct link between the 6-pin connectors and ignition,
- even if there is a fat 12V supply (which was very corroded).
Roy instead pointed me at the ignition lock, and as always I believe he was right - once I got
the thing out of the car I could first of all see that one of the leads coming off the lock was
scorched and when started to attempt to measure its workings, that wire simply came completely
loose and fell out of the connector.
And this was indeed the ignition wire !
The other is for cranking, and that seems to work just fine.
I have already treated the otherwise very tired and corroded looking wire with wonders of a
saturated salt solution in vinegar, - and the de-oxidising process stopped with a rinse in a
baking-powder solution, hence it looks fairly clean on the picture below.
My next challenge is to figure out how this connector on the ignition lock comes off, so I can
redo it.
![](http://www.matrasport.dk/Gallery/Med/ignition_lock.jpg)
/Lennart