Power not getting to glowplugs?

Hi I got a 2005 Rover 25 last week and cold starts are a nightmare.



I tested the plugs and they seemed ok so turned my attention to the circuit.



The 80a fuse is intact and the relay clicks but I removed the fuse then tried cold starting and its exactly the same as with the*circuit complete - it struggles and I'm thinking the plugs aren't even heating up at all.



Now I notice one wire going to the no2 glowplug and then the harness to link them all up.



How would I test this single wire to see if it's supplying any voltage to the plugs please? I only really want to undo the little glow plug nut on this one plug with the supply wire if I can help it.



Many thanks!

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