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!
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