Andy,
Looking at the wiring diagrams, the blue wire from the alternator goes to the dash warning light.
The blue/white wire goes via engine management D to the autochoke. The reason for this I think is that the choke is powered directly from the alternator, only when the engine is running.
If it was powered directly from an ignition switched supply you could warm the bi-metallic spring in the choke without the engine running, which would then partly turn the choke off. Not ideal in real cold start up conditions.
Cheers
Dave
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