Excellent advice from you both, Richard & Rog.
Yes, I intend to use Monty's column switch and the Morgan wiring, so it’s helpful to know the PCB that controls that circuit can be problematic, I assume/pray the circuit does also include a traditional make/break relay so it would be helpful to know where it lives?
With the wheel off I'm confident I'll find the illusive blue wires with a yellow trace, but it'll have to be done this weekend when I have a window of time with some daylight, I'll ground each lamp to chassis as recommended and make up a grounding loom if it makes sense to do so.
I certainly can't wait to light up my beautiful Marchals
Thanks again for all your help chaps, the Morgan community is definitely a great bunch
NB: Briskish standard automotive wiring colours can be found here, but these are probably as out of date as my knowledge
https://www.minimania.com/pdFile/wiringharnessoverview.pdf
