The relay is inside the dash-board cowling, toward the top/right side.
take a look at http://www.kubota.com/part/partsList.aspx
accept terms, enter your model number, do a "book search" by "part name," type in "relay glow." That'll lead you to a picture of what I mean.
there are two electronic components on the right upper side in the dash, held by a bracket with two bolts. would the controller be the one on the back, or the front? my glow plugs won't work at all, checked the dash bulb, and it good. going to check for corrosion on the glow plug connectors today....thanks for all help.