no power to glow plus

hi all been having trouble starting my freshly rebuilt 300tdi disco its a 96. anyways there is no power to any of the plugs, or cables and fixings are ok, and all have good contacts. there relay next to thefuse box under the bonnet seems to be working. the glow plug light comes on, then goes off after 10seconds. Checked the 10amp fuse under the dash, thats fine but there is no power at the fuse either. There was however i blue wire that had been stuffed into the fuse holder for the glow plug that seems to disappear over to n/s behind the dash. Anybody have any ideas as to why the glow plugs aren't working