Here is the late-model (second gen ECU) Roadster diagram (not ideal but it's all I've been able to get) - again shows no headlight relay other than the standard starter relay (item 64 in image below) - headlight current coming directly through the key-switch
It depends on the revision of that diagram however - if Triumph really did release an upgrade, this may be the pre-upgrade revision.
So again - if anyone has late-model Roadster Diagram, I'd love to see it.
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at the bottom of the schematic it says rocket III /classic.
that is before roadster.