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There's loads of info in this: http://hmvf.co.uk/pdf/ALL%20CHARGED%20UP%204%20ver4-1.pdf

What I said was incorrect, that mod was to introduce the protective cover. The mod I meant to refer to was on failure of the switch to either remove it from the circuit or if the IR facility was still required to fit a new switch to operate a relay. It was no longer a 'modification' but a...

Nope but I can tell you it is in EMER WHEELED VEHICLES Q 027 Mod Instr No. 52 April 1974. If anyone needs new labels for their switch there are some here: LANDROVER / MILITARY INFRA RED / HEADLIGHT NORMAL STICKERS. | eBay

The lower position of the switch is for infra-red vision using dark red glass filters over the headlights & the driver uses night vision binoculars. In this position all lights are extinguished other than the headlights irrespective of the position of the main light switch. The switch carried...