I now see where I was getting confused - I was assuming that the start relay that uses the signal from the inhibitor switch was live with a constant 24v. But according to the diagram (if I opened my eyes and read correctly) it says that the inhibitor circuit is switched in the ignition circuit.
So when the key is on, the P/N inhibitor switch will close or open the start relay, and the START position on the ignition switch energises the relay (which will only send power to the cranker if the P/N inhibitor closes the relay)
So if I earth the WHITE wire, the relay will close when the ignition switch is moved to START, and the cranker will do its thing.
The manual says that the brown relay wire is connected to ON or START. I don't know what variants the manual covers, but in mine, it must be connected to start. Considering if I bridge the two heavy wires, the engine will crank.
Cheers for the help, i've had the manual for a few months but must have kept mis reading this page on account of it saying "gasoline engine models"
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