You are welcome.
it was occurring under the following conditions :
-engine at operating temperature (probably 10 mins after starting)
-engine revs at >1500 rpm, and especially around 1800-2000 rpm
she was however able to idle..
Hmmm.. The lower the engine revs the fewer times the ignition system is doing its job and the fewer times the fault is being accessed. If it is a overcharged, the lower rpm means the
fewer times it is creating great heat. Be careful. If this is the situation, the coil will quickly get hot enough to burn your skin.
That is I never want you to try! When the engine stop/start occurred, it was during normal driving, with the clutch out and in gear. The tacho would drop to 0 rpm (engine stop), but then would immediately power up again, causing the tacho to jump as the engine turned on again (like a clutch start)
My complete question was:
Did you press in the clutch during those incident? Merely curious.
However the replacement of the ballast resistor and coil last night appears to have achieved the recommended impedences and voltages, and more importantly she is running again.
BRAVO! It all makes perfect sense. One minor addendum to our sleuthing. If you have long pivoting bonnet stays, (popularized by the aftermarket) make sure the one on the passenger side (on a RHD) does not touch
the ballast resistor. That will over charge the ignition system as I described. Happened to me once....in only 20 minutes of driving, just outside of Bristol. I burned out the coil and the distributor's photo-optic unit in that time only.
As I mentioned originally, I have a steep learning curve when it comes to all the mechanical and electrical issues with carby / distributer engines.
Although I now have picked up some info re the coils and and ignition modules, distributor timing does appear to be more complicated, and I will leave this until I need to learn more..
Easy peasy. Get the old strobe ignition light,
onewith no bells and whistles, and two extensions for your socket wrench along with a 5/8 (IIRC) or 15mm socket. That is all you need.
You LEARN very quickly. I predict sorting your Morgan, one problem at a time, will very enjoyable for you. So many new owners of older cars, especially Morgans, get fixated fixing them! Very soon you will start taking apart the obstinate family dishwasher.
gmg
