Thanks BillB for your reply. I ended up making a Y lead for the earth wire to connect an existing bullet connector in the loom behind the speedo.

I think I ended up finding the original wire, it was a black wire with a spade at one end (motor) and a bullet at the other. I'll look at the steering column wires now you've mentioned that.

Cheers

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1970 Mk2 Cooper S

On my 1970 S the black earth wire connects to a red multi connector as part of the loom under the parcel shelf near the flasher canister. Green with yellow trace power wire connects to the ignition switch.

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ex-NSW Police 1970 MK II Cooper S
VMCI #43