Ah bugger! :)
Will try again after reading your instructions properly, what a turkey. Thanks for the patient reply!!
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The switch works by running up a ramp on the selector shaft for the CDL.
it is adjustable as it has a locknut on its thread.
It may that it is just a bit loose.
Do not tighten it right up or it may prevent the CDL engaging.
The best way is to remove the console top, then adjust the switch while bridging the contacts with a multimeter set on ohms. but that is quite a PITA but may be the only way to accurately set it, so that it juuust closes as the CDL engages. If the switch is u/s after market ones are cheap but flimsy. Your eyes will water over the OEM cost , so I just filled the top of the switch with araldite.
regards PhilipA