The issue for me is that I know the brown wire is permanently live and has the ignition running off it.
The white is switched. What I do not understand is why the ignition doesn't operate through the (ignition) switched wire and why the system didn't discharge when it was fed by the dynamo as it must have had a live battery supply on starting.
Should the ignition switch have operated a relay to energise the ignition circuit from the live brown?
Not sure what the other brown does but there is clearly a switch on it somewhere (think it operates the fog lights).
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