Really helpful. I have managed to get a 12v feed to the coil by splicing of the big white wire under the ignition switch. Using the mallory ballast resistor supplied with new dizzy (like a TR4 one, big block with terminals on it) I'm now getting a spark so will next re-check and then try a start up! I can confirm its around 8v after the ballast resistor.
<b>Red 4.0 Litre V8 DHC Grinnall (with huuuuuge arches...!)</b>
