PEH,
The plural for ohmage is ohmages and the antonym is mhoes.
Mike,
You probably have a series system in that year. Check to see if you have something that looks like potato mashers between between the glow plugs. Your relay should be under the dash on the driver's side. The flat fuse link chould be mounted on the fire wall. Your problem may be a cracked fuse which makes or breaks with cranking vibration. If your fuse is cracked, it doesn't mean you have a problem. These fuses heat and cool with each glow cycle. This heating and cooling causes expansion and contraction of the fuse and it eventually breaks in half. I call it the beer can principle.
Peter