I've got a W-reg 2000 S80 D5 and it does not have a Glow Plug light on the dash or anything telling you engine is ready to start,it's been difficult to start and when measuring the voltage to the glowplugs it read zero volt and when it does get going is clouds of black smoke ,any ideas?thanks.

so no one knows anything about this problem?.

Have a bit of patience, you posted at 1:37 am, many people will not have even had a chance to read your post yet especially given it's a work day today.

the 2.5 glow plugs arent needed above 5 degrees C so only work below this temp