Wiring blues

[peterg]

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).

[peterg]

Problem solved. The white output was actually a white input to the controller (terminal A3). Tracing it back to the instrument panel it was on the other side of the ignition switch which has a (live) brown feed. It is shown (with a lead to the coil) on the 403 wiring diagram.

With the fused distribution box permanantly linked to the live feed I was sending a live to both sides of the switch. Still don't understand how it worked when the dynamo was in place though.

One step closer to risking it on the roads!