[Healeys] Headlamp wiring

[Simon Lachlan]

Could someone please tell me which wire is which regarding the three wires
that go to the headlights. These are black, blue with red tracer & blue with
white tracer.
>From the fact that the blue with white seems to go, via the dip switch, to
the main beam warning light in the speedo I guess I'm safe with the
following:-??
Blue with red = dipped beam
Blue with white = main beam
Black = earth
However, if I buy and wire in a halogen conversion I'd not like to see my
presumption go up in a pff of smoke and my loom with it! Can someone
confirm. The wiring diagram in the manual is not 100% idiot proof in this
instance.
Simon