Update:

Tried a different dizzy (many thanks to Marv).
No Change!

Sparking intermittently on two cylinders only and not at all on the other two.

Anyone able to tell me exactly what signals should be going into the ignition module?
I've got-
3. Blue Wire - 12v
2. Brown wire - Earth
1. yellow Green - nothing now but was 12v earlier (but also tried adding 12v with no effect!)

Basic stuff-
Coil - 12v and an earth is all it needs?


This is really puzzling me........