Red/orange is a switched live from the head light lighting switch via a fuse. Same as Red/black wire.
The Red/Yellow one with the diode is a feed for a fog lamp.
The only mention of purple in the wirirng diagram is as a tracer on a green wire and is from the brake circuit.
Green/red and green/white should be indicators.
Black for ground.
This is from TD5 wiring diagram.



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