Charging,?.

[David.H]

Sorry folks, I must be particularly dim....
The warning bulb holder has a central terminal on a sprung brass link from the IGN terminal on the back of the switchboard. This is live when the ignition is on. It doesn't have any insulation that I can see, but simply passes through a small hole in the switch panel... the bulb then completes the circuit to (earth?) by the threaded holder (via the solder blob on the outside of the bulb under the glass)?
Unless I make a physical earth from the threaded holder - Or the blob - (& thus to the bulb), the bulb will not light when the ignition is turned on.
Is the threaded brass holder supposed to be the earth return? The wiring diagram for the 1932 RN front tank saloon -which is as near as I can find for an AG tourer (which few authorities (like Rinsey Mills!) acknowledge exists! -
simply shows the brass link to the bulb base, other diagrams (Dorset Cut-Out Explained) show the feed coming from IGN , round the bulb and on to a terminal "D" on the back of the switch panel. However I think this is for a later version....
The engine starts & runs fine, but the warning light - if I earth the threaded holder - stays on. I imagine because I have completed the circuit artificially.
What turns off the warning light? does the cut out shut off the brass strip feed somehow?
I will try & take some pictures to add to the fun.
I think I will change my tag to:-
Perplexed of Stratford!