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hear no evil see no evil


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As Western says, check the feeds to the switches - they have their own feeds directly from the fuse box, unlike the indicator and normal dim/dip contacts. Check not only the security of the contacts but also their condition - look for dirt and corrosion; a dull grey surface on the terminals might not look too bad, but it can completely block the current, even though the voltage might read OK across the joints (resistance will not affect voltage until a demand is put on the system, at which point the resistance becomes effective and the voltage drops off - imagine the pressure at a tap with a very thin feed pipe; the presure at the tap will be at mains pressure until you open the tap, at which point the water flow is too restricted to keep up with demand and the pressure drops).

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